diff --git a/common/src/main/java/com/alibaba/nacos/common/utils/Md5Utils.java b/common/src/main/java/com/alibaba/nacos/common/utils/Md5Utils.java
index df2db20d5db..1867561a6c8 100644
--- a/common/src/main/java/com/alibaba/nacos/common/utils/Md5Utils.java
+++ b/common/src/main/java/com/alibaba/nacos/common/utils/Md5Utils.java
@@ -15,7 +15,9 @@
  */
 package com.alibaba.nacos.common.utils;
 
-import java.io.UnsupportedEncodingException;
+import java.math.BigInteger;
+import java.security.MessageDigest;
+import java.security.NoSuchAlgorithmException;
 
 /**
  * MD5 generator
@@ -24,35 +26,34 @@
  */
 public class Md5Utils {
 
+    private static ThreadLocal<MessageDigest> MESSAGE_DIGEST_LOCAL = new ThreadLocal<MessageDigest>() {
+        @Override
+        protected MessageDigest initialValue() {
+            try {
+                return MessageDigest.getInstance("MD5");
+            } catch (NoSuchAlgorithmException e) {
+                return null;
+            }
+        }
+    };
+
     private static final int HEX_VALUE_COUNT = 16;
 
-    public static String getMD5(byte[] bytes) {
-        char[] hexDigits = {'0', '1', '2', '3', '4', '5', '6', '7', '8', '9', 'a', 'b', 'c', 'd', 'e', 'f'};
-        char[] str = new char[16 * 2];
-        try {
-            java.security.MessageDigest md = java.security.MessageDigest.getInstance("MD5");
-            md.update(bytes);
-            byte[] tmp = md.digest();
-            int k = 0;
-            for (int i = 0; i < HEX_VALUE_COUNT; i++) {
-                byte byte0 = tmp[i];
-                str[k++] = hexDigits[byte0 >>> 4 & 0xf];
-                str[k++] = hexDigits[byte0 & 0xf];
-            }
-        } catch (Exception e) {
-            e.printStackTrace();
+    public static String getMD5(byte[] bytes) throws NoSuchAlgorithmException {
+
+        MessageDigest messageDigest = MESSAGE_DIGEST_LOCAL.get();
+        if (messageDigest != null) {
+            return new BigInteger(1, messageDigest.digest(bytes)).toString(HEX_VALUE_COUNT);
         }
-        return new String(str);
+
+        throw new NoSuchAlgorithmException("MessageDigest get MD5 instance error");
     }
 
     public static String getMD5(String value, String encode) {
-        String result = "";
         try {
-            result = getMD5(value.getBytes(encode));
-        } catch (UnsupportedEncodingException e) {
-            e.printStackTrace();
+            return getMD5(value.getBytes(encode));
+        } catch (Exception e) {
+            throw new RuntimeException(e);
         }
-
-        return result;
     }
 }
diff --git a/config/src/main/java/com/alibaba/nacos/config/server/aspect/RequestLogAspect.java b/config/src/main/java/com/alibaba/nacos/config/server/aspect/RequestLogAspect.java
index d45eb42faaf..ee6092c61f2 100755
--- a/config/src/main/java/com/alibaba/nacos/config/server/aspect/RequestLogAspect.java
+++ b/config/src/main/java/com/alibaba/nacos/config/server/aspect/RequestLogAspect.java
@@ -15,11 +15,12 @@
  */
 package com.alibaba.nacos.config.server.aspect;
 
+import com.alibaba.nacos.common.utils.Md5Utils;
+import com.alibaba.nacos.config.server.constant.Constants;
 import com.alibaba.nacos.config.server.monitor.MetricsMonitor;
 import com.alibaba.nacos.config.server.service.ConfigService;
 import com.alibaba.nacos.config.server.utils.GroupKey2;
 import com.alibaba.nacos.config.server.utils.LogUtil;
-import com.alibaba.nacos.config.server.utils.MD5;
 import com.alibaba.nacos.config.server.utils.RequestUtil;
 import org.aspectj.lang.ProceedingJoinPoint;
 import org.aspectj.lang.annotation.Around;
@@ -66,7 +67,7 @@ public class RequestLogAspect {
     public Object interfacePublishSingle(ProceedingJoinPoint pjp, HttpServletRequest request,
                                          HttpServletResponse response, String dataId, String group, String tenant,
                                          String content) throws Throwable {
-        final String md5 = content == null ? null : MD5.getInstance().getMD5String(content);
+        final String md5 = content == null ? null : Md5Utils.getMD5(content, Constants.ENCODE);
         MetricsMonitor.getPublishMonitor().incrementAndGet();
         return logClientRequest("publish", pjp, request, response, dataId, group, tenant, md5);
     }
diff --git a/config/src/main/java/com/alibaba/nacos/config/server/model/ConfigInfoBase.java b/config/src/main/java/com/alibaba/nacos/config/server/model/ConfigInfoBase.java
index 55151910e94..a6cf6944952 100644
--- a/config/src/main/java/com/alibaba/nacos/config/server/model/ConfigInfoBase.java
+++ b/config/src/main/java/com/alibaba/nacos/config/server/model/ConfigInfoBase.java
@@ -15,7 +15,8 @@
  */
 package com.alibaba.nacos.config.server.model;
 
-import com.alibaba.nacos.config.server.utils.MD5;
+import com.alibaba.nacos.common.utils.Md5Utils;
+import com.alibaba.nacos.config.server.constant.Constants;
 
 import java.io.PrintWriter;
 import java.io.Serializable;
@@ -46,7 +47,7 @@ public ConfigInfoBase(String dataId, String group, String content) {
         this.group = group;
         this.content = content;
         if (this.content != null) {
-            this.md5 = MD5.getInstance().getMD5String(this.content);
+            this.md5 = Md5Utils.getMD5(this.content, Constants.ENCODE);
         }
     }
 
diff --git a/config/src/main/java/com/alibaba/nacos/config/server/service/ConfigService.java b/config/src/main/java/com/alibaba/nacos/config/server/service/ConfigService.java
index 62c79028c80..8c9fa115434 100644
--- a/config/src/main/java/com/alibaba/nacos/config/server/service/ConfigService.java
+++ b/config/src/main/java/com/alibaba/nacos/config/server/service/ConfigService.java
@@ -15,12 +15,12 @@
  */
 package com.alibaba.nacos.config.server.service;
 
+import com.alibaba.nacos.common.utils.Md5Utils;
 import com.alibaba.nacos.config.server.constant.Constants;
 import com.alibaba.nacos.config.server.model.CacheItem;
 import com.alibaba.nacos.config.server.model.ConfigInfoBase;
 import com.alibaba.nacos.config.server.utils.GroupKey;
 import com.alibaba.nacos.config.server.utils.GroupKey2;
-import com.alibaba.nacos.config.server.utils.MD5;
 import com.alibaba.nacos.config.server.utils.PropertyUtil;
 import com.alibaba.nacos.config.server.utils.event.EventDispatcher;
 import org.apache.commons.lang3.StringUtils;
@@ -70,7 +70,8 @@ static public boolean dump(String dataId, String group, String tenant, String co
         }
 
         try {
-            final String md5 = MD5.getInstance().getMD5String(content);
+            final String md5 = Md5Utils.getMD5(content, Constants.ENCODE);
+
             if (md5.equals(ConfigService.getContentMd5(groupKey))) {
                 dumpLog.warn(
                     "[dump-ignore] ignore to save cache file. groupKey={}, md5={}, lastModifiedOld={}, "
@@ -115,7 +116,7 @@ static public boolean dumpBeta(String dataId, String group, String tenant, Strin
         }
 
         try {
-            final String md5 = MD5.getInstance().getMD5String(content);
+            final String md5 = Md5Utils.getMD5(content, Constants.ENCODE);
             if (md5.equals(ConfigService.getContentBetaMd5(groupKey))) {
                 dumpLog.warn(
                     "[dump-beta-ignore] ignore to save cache file. groupKey={}, md5={}, lastModifiedOld={}, "
@@ -154,7 +155,7 @@ static public boolean dumpTag(String dataId, String group, String tenant, String
         }
 
         try {
-            final String md5 = MD5.getInstance().getMD5String(content);
+            final String md5 = Md5Utils.getMD5(content, Constants.ENCODE);
             if (md5.equals(ConfigService.getContentTagMd5(groupKey, tag))) {
                 dumpLog.warn(
                     "[dump-tag-ignore] ignore to save cache file. groupKey={}, md5={}, lastModifiedOld={}, "
@@ -191,7 +192,7 @@ static public boolean dumpChange(String dataId, String group, String tenant, Str
         }
 
         try {
-            final String md5 = MD5.getInstance().getMD5String(content);
+            final String md5 = Md5Utils.getMD5(content, Constants.ENCODE);
             if (!STANDALONE_MODE || PropertyUtil.isStandaloneUseMysql()) {
                 String loacalMd5 = DiskUtil.getLocalConfigMd5(dataId, group, tenant);
                 if (md5.equals(loacalMd5)) {
diff --git a/config/src/main/java/com/alibaba/nacos/config/server/service/DiskUtil.java b/config/src/main/java/com/alibaba/nacos/config/server/service/DiskUtil.java
index d72e77a58a4..5d0450f0eb8 100644
--- a/config/src/main/java/com/alibaba/nacos/config/server/service/DiskUtil.java
+++ b/config/src/main/java/com/alibaba/nacos/config/server/service/DiskUtil.java
@@ -16,9 +16,9 @@
 package com.alibaba.nacos.config.server.service;
 
 import com.alibaba.nacos.common.utils.IoUtils;
+import com.alibaba.nacos.common.utils.Md5Utils;
 import com.alibaba.nacos.config.server.constant.Constants;
 import com.alibaba.nacos.config.server.utils.LogUtil;
-import com.alibaba.nacos.config.server.utils.MD5;
 import org.apache.commons.io.FileUtils;
 import org.apache.commons.lang3.StringUtils;
 import org.slf4j.Logger;
@@ -172,7 +172,7 @@ static public String getConfig(String dataId, String group, String tenant)
 
     static public String getLocalConfigMd5(String dataId, String group, String tenant)
         throws IOException {
-        return MD5.getInstance().getMD5String(getConfig(dataId, group, tenant));
+        return Md5Utils.getMD5(getConfig(dataId, group, tenant), Constants.ENCODE);
     }
 
     static public File heartBeatFile() {
diff --git a/config/src/main/java/com/alibaba/nacos/config/server/service/PersistService.java b/config/src/main/java/com/alibaba/nacos/config/server/service/PersistService.java
index 96c1f7b4a4d..82635f2c684 100755
--- a/config/src/main/java/com/alibaba/nacos/config/server/service/PersistService.java
+++ b/config/src/main/java/com/alibaba/nacos/config/server/service/PersistService.java
@@ -15,11 +15,12 @@
  */
 package com.alibaba.nacos.config.server.service;
 
+import com.alibaba.nacos.common.utils.Md5Utils;
+import com.alibaba.nacos.config.server.constant.Constants;
 import com.alibaba.nacos.config.server.enums.FileTypeEnum;
 import com.alibaba.nacos.api.exception.NacosException;
 import com.alibaba.nacos.config.server.model.*;
 import com.alibaba.nacos.config.server.utils.LogUtil;
-import com.alibaba.nacos.config.server.utils.MD5;
 import com.alibaba.nacos.config.server.utils.PaginationHelper;
 import com.alibaba.nacos.config.server.utils.ParamUtils;
 import com.alibaba.nacos.config.server.utils.event.EventDispatcher;
@@ -537,7 +538,7 @@ public void addConfigInfo4Beta(ConfigInfo configInfo, String betaIps,
         String appNameTmp = StringUtils.isBlank(configInfo.getAppName()) ? StringUtils.EMPTY : configInfo.getAppName();
         String tenantTmp = StringUtils.isBlank(configInfo.getTenant()) ? StringUtils.EMPTY : configInfo.getTenant();
         try {
-            String md5 = MD5.getInstance().getMD5String(configInfo.getContent());
+            String md5 = Md5Utils.getMD5(configInfo.getContent(), Constants.ENCODE);
             jt.update(
                 "INSERT INTO config_info_beta(data_id,group_id,tenant_id,app_name,content,md5,beta_ips,src_ip,"
                     + "src_user,gmt_create,gmt_modified) VALUES(?,?,?,?,?,?,?,?,?,?,?)",
@@ -563,7 +564,7 @@ public void addConfigInfo4Tag(ConfigInfo configInfo, String tag, String srcIp, S
         String tenantTmp = StringUtils.isBlank(configInfo.getTenant()) ? StringUtils.EMPTY : configInfo.getTenant();
         String tagTmp = StringUtils.isBlank(tag) ? StringUtils.EMPTY : tag.trim();
         try {
-            String md5 = MD5.getInstance().getMD5String(configInfo.getContent());
+            String md5 = Md5Utils.getMD5(configInfo.getContent(), Constants.ENCODE);
             jt.update(
                 "INSERT INTO config_info_tag(data_id,group_id,tenant_id,tag_id,app_name,content,md5,src_ip,src_user,"
                     + "gmt_create,gmt_modified) VALUES(?,?,?,?,?,?,?,?,?,?,?)",
@@ -627,7 +628,7 @@ public void updateConfigInfo4Beta(ConfigInfo configInfo, String srcIp, String sr
         String appNameTmp = StringUtils.isBlank(configInfo.getAppName()) ? StringUtils.EMPTY : configInfo.getAppName();
         String tenantTmp = StringUtils.isBlank(configInfo.getTenant()) ? StringUtils.EMPTY : configInfo.getTenant();
         try {
-            String md5 = MD5.getInstance().getMD5String(configInfo.getContent());
+            String md5 = Md5Utils.getMD5(configInfo.getContent(), Constants.ENCODE);
             jt.update(
                 "UPDATE config_info_beta SET content=?, md5 = ?, src_ip=?,src_user=?,gmt_modified=?,app_name=? WHERE "
                     + "data_id=? AND group_id=? AND tenant_id=?",
@@ -653,7 +654,7 @@ public void updateConfigInfo4Tag(ConfigInfo configInfo, String tag, String srcIp
         String tenantTmp = StringUtils.isBlank(configInfo.getTenant()) ? StringUtils.EMPTY : configInfo.getTenant();
         String tagTmp = StringUtils.isBlank(tag) ? StringUtils.EMPTY : tag.trim();
         try {
-            String md5 = MD5.getInstance().getMD5String(configInfo.getContent());
+            String md5 = Md5Utils.getMD5(configInfo.getContent(), Constants.ENCODE);
             jt.update(
                 "UPDATE config_info_tag SET content=?, md5 = ?, src_ip=?,src_user=?,gmt_modified=?,app_name=? WHERE "
                     + "data_id=? AND group_id=? AND tenant_id=? AND tag_id=?",
@@ -2694,7 +2695,7 @@ private long addConfigInfoAtomic(final String srcIp, final String srcUser, final
         final String type = configAdvanceInfo == null ? null : (String) configAdvanceInfo.get("type");
         final String schema = configAdvanceInfo == null ? null : (String) configAdvanceInfo.get("schema");
 
-        final String md5Tmp = MD5.getInstance().getMD5String(configInfo.getContent());
+        final String md5Tmp = Md5Utils.getMD5(configInfo.getContent(), Constants.ENCODE);
 
         KeyHolder keyHolder = new GeneratedKeyHolder();
 
@@ -2903,7 +2904,7 @@ private void updateConfigInfoAtomic(final ConfigInfo configInfo, final String sr
                                         final Timestamp time, Map<String, Object> configAdvanceInfo) {
         String appNameTmp = StringUtils.isBlank(configInfo.getAppName()) ? StringUtils.EMPTY : configInfo.getAppName();
         String tenantTmp = StringUtils.isBlank(configInfo.getTenant()) ? StringUtils.EMPTY : configInfo.getTenant();
-        final String md5Tmp = MD5.getInstance().getMD5String(configInfo.getContent());
+        final String md5Tmp = Md5Utils.getMD5(configInfo.getContent(), Constants.ENCODE);
         String desc = configAdvanceInfo == null ? null : (String) configAdvanceInfo.get("desc");
         String use = configAdvanceInfo == null ? null : (String) configAdvanceInfo.get("use");
         String effect = configAdvanceInfo == null ? null : (String) configAdvanceInfo.get("effect");
@@ -3060,7 +3061,7 @@ private void insertConfigHistoryAtomic(long id, ConfigInfo configInfo, String sr
                                            final Timestamp time, String ops) {
         String appNameTmp = StringUtils.isBlank(configInfo.getAppName()) ? StringUtils.EMPTY : configInfo.getAppName();
         String tenantTmp = StringUtils.isBlank(configInfo.getTenant()) ? StringUtils.EMPTY : configInfo.getTenant();
-        final String md5Tmp = MD5.getInstance().getMD5String(configInfo.getContent());
+        final String md5Tmp = Md5Utils.getMD5(configInfo.getContent(), Constants.ENCODE);
         try {
             jt.update(
                 "INSERT INTO his_config_info (id,data_id,group_id,tenant_id,app_name,content,md5,src_ip,src_user,gmt_modified,op_type) VALUES(?,?,?,?,?,?,?,?,?,?,?)",
@@ -3354,8 +3355,7 @@ public Boolean completeMd5() {
                     String md5InDb = cf.getMd5();
                     final String content = cf.getContent();
                     final String tenant = cf.getTenant();
-                    final String md5 = MD5.getInstance().getMD5String(
-                        content);
+                    final String md5 = Md5Utils.getMD5(content, Constants.ENCODE);
                     if (StringUtils.isBlank(md5InDb)) {
                         try {
                             updateMd5(cf.getDataId(), cf.getGroup(), tenant, md5, new Timestamp(cf.getLastModified()));
diff --git a/config/src/main/java/com/alibaba/nacos/config/server/service/dump/DumpService.java b/config/src/main/java/com/alibaba/nacos/config/server/service/dump/DumpService.java
index e0945ef79c3..0a59ceadbee 100755
--- a/config/src/main/java/com/alibaba/nacos/config/server/service/dump/DumpService.java
+++ b/config/src/main/java/com/alibaba/nacos/config/server/service/dump/DumpService.java
@@ -16,6 +16,7 @@
 package com.alibaba.nacos.config.server.service.dump;
 
 import com.alibaba.nacos.common.utils.IoUtils;
+import com.alibaba.nacos.common.utils.Md5Utils;
 import com.alibaba.nacos.config.server.constant.Constants;
 import com.alibaba.nacos.config.server.manager.TaskManager;
 import com.alibaba.nacos.config.server.model.ConfigInfo;
@@ -346,7 +347,8 @@ public void run() {
                         ConfigInfo cf = MergeTaskProcessor.merge(dataId, group, tenant, datumList);
                         String aggrContent = cf.getContent();
                         String localContentMD5 = ConfigService.getContentMd5(GroupKey.getKey(dataId, group));
-                        String aggrConetentMD5 = MD5.getInstance().getMD5String(aggrContent);
+                        String aggrConetentMD5 = Md5Utils.getMD5(aggrContent, Constants.ENCODE);
+
                         if (!StringUtils.equals(localContentMD5, aggrConetentMD5)) {
                             persistService.insertOrUpdate(null, null, cf, time, null, false);
                             log.info("[merge-ok] {}, {}, size={}, length={}, md5={}, content={}", dataId, group,
diff --git a/config/src/main/java/com/alibaba/nacos/config/server/service/dump/DumpTask.java b/config/src/main/java/com/alibaba/nacos/config/server/service/dump/DumpTask.java
index c7ba1d98380..e3479f58b8c 100755
--- a/config/src/main/java/com/alibaba/nacos/config/server/service/dump/DumpTask.java
+++ b/config/src/main/java/com/alibaba/nacos/config/server/service/dump/DumpTask.java
@@ -15,6 +15,8 @@
  */
 package com.alibaba.nacos.config.server.service.dump;
 
+import com.alibaba.nacos.common.utils.Md5Utils;
+import com.alibaba.nacos.config.server.constant.Constants;
 import com.alibaba.nacos.config.server.manager.AbstractTask;
 import com.alibaba.nacos.config.server.manager.TaskProcessor;
 import com.alibaba.nacos.config.server.model.ConfigInfo;
@@ -28,7 +30,6 @@
 import com.alibaba.nacos.config.server.service.trace.ConfigTraceService;
 import com.alibaba.nacos.config.server.utils.GroupKey2;
 import com.alibaba.nacos.config.server.utils.LogUtil;
-import com.alibaba.nacos.config.server.utils.MD5;
 import org.apache.commons.lang3.StringUtils;
 
 import java.sql.Timestamp;
@@ -264,7 +265,7 @@ public boolean process(String taskType, AbstractTask task) {
                         cf.getLastModified(), cf.getType());
 
                     final String content = cf.getContent();
-                    final String md5 = MD5.getInstance().getMD5String(content);
+                    final String md5 = Md5Utils.getMD5(content, Constants.ENCODE);
                     LogUtil.dumpLog.info("[dump-all-ok] {}, {}, length={}, md5={}",
                         GroupKey2.getKey(cf.getDataId(), cf.getGroup()), cf.getLastModified(), content.length(), md5);
                 }
@@ -409,7 +410,7 @@ public boolean process(String taskType, AbstractTask task) {
             boolean result = ConfigService.dumpChange(cf.getDataId(), cf.getGroup(), cf.getTenant(),
                 cf.getContent(), cf.getLastModified());
             final String content = cf.getContent();
-            final String md5 = MD5.getInstance().getMD5String(content);
+            final String md5 = Md5Utils.getMD5(content, Constants.ENCODE);
             LogUtil.defaultLog.info(
                 "[dump-change-ok] {}, {}, length={}, md5={}",
                 new Object[] {
diff --git a/config/src/main/java/com/alibaba/nacos/config/server/service/trace/ConfigTraceService.java b/config/src/main/java/com/alibaba/nacos/config/server/service/trace/ConfigTraceService.java
index 5821068400f..1775cf89345 100644
--- a/config/src/main/java/com/alibaba/nacos/config/server/service/trace/ConfigTraceService.java
+++ b/config/src/main/java/com/alibaba/nacos/config/server/service/trace/ConfigTraceService.java
@@ -15,9 +15,10 @@
  */
 package com.alibaba.nacos.config.server.service.trace;
 
+import com.alibaba.nacos.common.utils.Md5Utils;
+import com.alibaba.nacos.config.server.constant.Constants;
 import com.alibaba.nacos.config.server.monitor.MetricsMonitor;
 import com.alibaba.nacos.config.server.utils.LogUtil;
-import com.alibaba.nacos.config.server.utils.MD5;
 import org.apache.commons.lang3.StringUtils;
 import org.springframework.stereotype.Service;
 
@@ -61,7 +62,8 @@ public static void logPersistenceEvent(String dataId, String group, String tenan
         }
         //localIp | dataid | group | tenant | requestIpAppName | ts | handleIp | event | type | [delayed = -1] | ext
         // (md5)
-        String md5 = content == null ? null : MD5.getInstance().getMD5String(content);
+        String md5 = content == null ? null : Md5Utils.getMD5(content, Constants.ENCODE);
+
         LogUtil.traceLog.info("{}|{}|{}|{}|{}|{}|{}|{}|{}|{}|{}", LOCAL_IP, dataId, group, tenant,
             requestIpAppName, ts, handleIp, "persist", type, -1, md5);
     }
diff --git a/config/src/main/java/com/alibaba/nacos/config/server/utils/MD5.java b/config/src/main/java/com/alibaba/nacos/config/server/utils/MD5.java
deleted file mode 100644
index 773625d7dad..00000000000
--- a/config/src/main/java/com/alibaba/nacos/config/server/utils/MD5.java
+++ /dev/null
@@ -1,155 +0,0 @@
-/*
- * Copyright 1999-2018 Alibaba Group Holding Ltd.
- *
- * Licensed under the Apache License, Version 2.0 (the "License");
- * you may not use this file except in compliance with the License.
- * You may obtain a copy of the License at
- *
- *      http://www.apache.org/licenses/LICENSE-2.0
- *
- * Unless required by applicable law or agreed to in writing, software
- * distributed under the License is distributed on an "AS IS" BASIS,
- * WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
- * See the License for the specific language governing permissions and
- * limitations under the License.
- */
-package com.alibaba.nacos.config.server.utils;
-
-import com.alibaba.nacos.config.server.constant.Constants;
-import com.google.common.collect.Maps;
-import java.io.UnsupportedEncodingException;
-import java.security.MessageDigest;
-import java.util.Map;
-import java.util.concurrent.locks.ReentrantLock;
-
-/**
- * md5
- *
- * @author Nacos
- */
-@SuppressWarnings("PMD.ClassNamingShouldBeCamelRule")
-public class MD5 {
-    private static char[] digits = {'0', '1', '2', '3', '4', '5', '6', '7', '8', '9', 'a', 'b', 'c', 'd', 'e', 'f'};
-    private static final int DIGITS_COUNT = 16;
-    private static final int DIGITS_CHAR_SIZE = 32;
-
-    private static Map<Character, Integer> rDigits = Maps.newHashMapWithExpectedSize(16);
-
-    static {
-        for (int i = 0; i < digits.length; ++i) {
-            rDigits.put(digits[i], i);
-        }
-    }
-
-    private static MD5 me = new MD5();
-    private MessageDigest mHasher;
-    private ReentrantLock opLock = new ReentrantLock();
-
-    private MD5() {
-        try {
-            mHasher = MessageDigest.getInstance("md5");
-        } catch (Exception e) {
-            throw new RuntimeException(e);
-        }
-
-    }
-
-    public static MD5 getInstance() {
-        return me;
-    }
-
-    public String getMD5String(String content) {
-        return bytes2string(hash(content));
-    }
-
-    public String getMD5String(byte[] content) {
-        return bytes2string(hash(content));
-    }
-
-    public byte[] getMD5Bytes(byte[] content) {
-        return hash(content);
-    }
-
-    /**
-     * 对字符串进行md5
-     *
-     * @param str
-     * @return md5 byte[16]
-     */
-    public byte[] hash(String str) {
-        opLock.lock();
-        try {
-            byte[] bt = mHasher.digest(str.getBytes(Constants.ENCODE));
-            if (null == bt || bt.length != DIGITS_COUNT) {
-                throw new IllegalArgumentException("md5 need");
-            }
-            return bt;
-        } catch (UnsupportedEncodingException e) {
-            throw new RuntimeException("unsupported utf-8 encoding", e);
-        } finally {
-            opLock.unlock();
-        }
-    }
-
-    /**
-     * 对二进制数据进行md5
-     *
-     * @param str
-     * @return md5 byte[16]
-     */
-    public byte[] hash(byte[] data) {
-        opLock.lock();
-        try {
-            byte[] bt = mHasher.digest(data);
-            if (null == bt || bt.length != DIGITS_COUNT) {
-                throw new IllegalArgumentException("md5 need");
-            }
-            return bt;
-        } finally {
-            opLock.unlock();
-        }
-    }
-
-    /**
-     * 将一个字节数组转化为可见的字符串
-     *
-     * @param bt
-     * @return
-     */
-    public String bytes2string(byte[] bt) {
-        int l = bt.length;
-
-        char[] out = new char[l << 1];
-
-        for (int i = 0, j = 0; i < l; i++) {
-            out[j++] = digits[(0xF0 & bt[i]) >>> 4];
-            out[j++] = digits[0x0F & bt[i]];
-        }
-
-        return new String(out);
-    }
-
-    /**
-     * 将字符串转换为bytes
-     *
-     * @param str
-     * @return byte[]
-     */
-    public byte[] string2bytes(String str) {
-        if (null == str) {
-            throw new NullPointerException("参数不能为空");
-        }
-        if (str.length() != DIGITS_CHAR_SIZE) {
-            throw new IllegalArgumentException("字符串长度必须是32");
-        }
-        byte[] data = new byte[16];
-        char[] chs = str.toCharArray();
-        for (int i = 0; i < DIGITS_COUNT; ++i) {
-            int h = rDigits.get(chs[i * 2]);
-            int l = rDigits.get(chs[i * 2 + 1]);
-            data[i] = (byte)((h & 0x0F) << 4 | (l & 0x0F));
-        }
-        return data;
-    }
-
-}
diff --git a/naming/src/main/java/com/alibaba/nacos/naming/core/Instances.java b/naming/src/main/java/com/alibaba/nacos/naming/core/Instances.java
index 49ad3b913e8..55d16bb151a 100644
--- a/naming/src/main/java/com/alibaba/nacos/naming/core/Instances.java
+++ b/naming/src/main/java/com/alibaba/nacos/naming/core/Instances.java
@@ -17,15 +17,10 @@
 
 import com.alibaba.fastjson.JSON;
 import com.alibaba.fastjson.annotation.JSONField;
-import com.alibaba.nacos.naming.misc.Loggers;
+import com.alibaba.nacos.common.utils.Md5Utils;
 import com.alibaba.nacos.naming.pojo.Record;
-import org.apache.commons.lang3.RandomStringUtils;
 import org.apache.commons.lang3.StringUtils;
 
-import java.math.BigInteger;
-import java.nio.charset.Charset;
-import java.security.MessageDigest;
-import java.security.NoSuchAlgorithmException;
 import java.util.ArrayList;
 import java.util.Collections;
 import java.util.List;
@@ -39,17 +34,6 @@
  */
 public class Instances implements Record {
 
-    private static MessageDigest MESSAGE_DIGEST;
-
-    static {
-        try {
-            MESSAGE_DIGEST = MessageDigest.getInstance("MD5");
-        } catch (NoSuchAlgorithmException e) {
-            Loggers.SRV_LOG.error("error while calculating checksum(md5) for instances", e);
-            MESSAGE_DIGEST = null;
-        }
-    }
-
     private List<Instance> instanceList = new ArrayList<>();
 
     public List<Instance> getInstanceList() {
@@ -73,7 +57,6 @@ public String getChecksum() {
     }
 
     private String recalculateChecksum() {
-        String checksum;
         StringBuilder sb = new StringBuilder();
         Collections.sort(instanceList);
         for (Instance ip : instanceList) {
@@ -83,13 +66,7 @@ private String recalculateChecksum() {
             sb.append(",");
         }
 
-        if (MESSAGE_DIGEST != null) {
-            checksum =
-                new BigInteger(1, MESSAGE_DIGEST.digest((sb.toString()).getBytes(Charset.forName("UTF-8")))).toString(16);
-        } else {
-            checksum = RandomStringUtils.randomAscii(32);
-        }
-        return checksum;
+        return Md5Utils.getMD5(sb.toString(), "UTF-8");
     }
 
     public String convertMap2String(Map<String, String> map) {
diff --git a/naming/src/main/java/com/alibaba/nacos/naming/core/Service.java b/naming/src/main/java/com/alibaba/nacos/naming/core/Service.java
index 5862ea50966..147fe13007b 100644
--- a/naming/src/main/java/com/alibaba/nacos/naming/core/Service.java
+++ b/naming/src/main/java/com/alibaba/nacos/naming/core/Service.java
@@ -17,6 +17,7 @@
 
 import com.alibaba.fastjson.JSON;
 import com.alibaba.fastjson.annotation.JSONField;
+import com.alibaba.nacos.common.utils.Md5Utils;
 import com.alibaba.nacos.naming.boot.SpringContext;
 import com.alibaba.nacos.naming.consistency.KeyBuilder;
 import com.alibaba.nacos.naming.consistency.RecordListener;
@@ -32,12 +33,8 @@
 import com.alibaba.nacos.naming.selector.Selector;
 import org.apache.commons.collections.CollectionUtils;
 import org.apache.commons.collections.ListUtils;
-import org.apache.commons.lang3.RandomStringUtils;
 import org.apache.commons.lang3.StringUtils;
 
-import java.math.BigInteger;
-import java.nio.charset.Charset;
-import java.security.MessageDigest;
 import java.util.*;
 
 /**
@@ -475,21 +472,7 @@ public synchronized void recalculateChecksum() {
             ipsString.append(",");
         }
 
-        try {
-            String result;
-            try {
-                MessageDigest md5 = MessageDigest.getInstance("MD5");
-                result = new BigInteger(1, md5.digest((ipsString.toString()).getBytes(Charset.forName("UTF-8")))).toString(16);
-            } catch (Exception e) {
-                Loggers.SRV_LOG.error("[NACOS-DOM] error while calculating checksum(md5)", e);
-                result = RandomStringUtils.randomAscii(32);
-            }
-
-            checksum = result;
-        } catch (Exception e) {
-            Loggers.SRV_LOG.error("[NACOS-DOM] error while calculating checksum(md5)", e);
-            checksum = RandomStringUtils.randomAscii(32);
-        }
+        checksum = Md5Utils.getMD5(ipsString.toString(), "UTF-8");
     }
 
     private void updateOrAddCluster(Collection<Cluster> clusters) {
diff --git a/naming/src/test/java/com/alibaba/nacos/naming/core/InstancesTest.java b/naming/src/test/java/com/alibaba/nacos/naming/core/InstancesTest.java
new file mode 100644
index 00000000000..630d7d15934
--- /dev/null
+++ b/naming/src/test/java/com/alibaba/nacos/naming/core/InstancesTest.java
@@ -0,0 +1,112 @@
+/*
+ * Copyright 1999-2018 Alibaba Group Holding Ltd.
+ *
+ * Licensed under the Apache License, Version 2.0 (the "License");
+ * you may not use this file except in compliance with the License.
+ * You may obtain a copy of the License at
+ *
+ *      http://www.apache.org/licenses/LICENSE-2.0
+ *
+ * Unless required by applicable law or agreed to in writing, software
+ * distributed under the License is distributed on an "AS IS" BASIS,
+ * WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
+ * See the License for the specific language governing permissions and
+ * limitations under the License.
+ */
+package com.alibaba.nacos.naming.core;
+
+import org.junit.Test;
+
+import java.math.BigInteger;
+import java.nio.charset.Charset;
+import java.security.MessageDigest;
+import java.security.NoSuchAlgorithmException;
+import java.util.concurrent.CountDownLatch;
+import java.util.concurrent.atomic.AtomicBoolean;
+
+/**
+ * @author lkxiaolou
+ */
+public class InstancesTest {
+
+    private static MessageDigest MESSAGE_DIGEST;
+
+    static {
+        try {
+            MESSAGE_DIGEST = MessageDigest.getInstance("MD5");
+        } catch (NoSuchAlgorithmException e) {
+            MESSAGE_DIGEST = null;
+        }
+    }
+
+    private static ThreadLocal<MessageDigest> MESSAGE_DIGEST_LOCAL = new ThreadLocal<MessageDigest>() {
+        @Override
+        protected MessageDigest initialValue() {
+            try {
+                return MessageDigest.getInstance("MD5");
+            } catch (NoSuchAlgorithmException e) {
+                return null;
+            }
+        }
+    };
+
+    @Test
+    public void checkSumNotThreadSafe() throws Exception {
+
+        final AtomicBoolean catchException = new AtomicBoolean(false);
+        CountDownLatch countDownLatch = new CountDownLatch(4);
+
+        for (int i = 0; i < 4; i++) {
+            Thread thread = new Thread(new Runnable() {
+                @Override
+                public void run() {
+                    while (true) {
+                        if (catchException.get()) {
+                            break;
+                        }
+                        try {
+                            checkSumThreadNotSafeVersion("test");
+                        } catch (ArrayIndexOutOfBoundsException e) {
+                            catchException.set(true);
+                        }
+                    }
+                    countDownLatch.countDown();
+                }
+            });
+            thread.start();
+        }
+
+        countDownLatch.await();
+
+        assert catchException.get();
+    }
+
+    //@Test
+    // 跑起来比较久，所以注释掉
+    public void checkSumThreadSafe() throws Exception {
+
+        CountDownLatch countDownLatch = new CountDownLatch(4);
+
+        for (int i = 0; i < 4; i++) {
+            Thread thread = new Thread(new Runnable() {
+                @Override
+                public void run() {
+                    for (int j = 0; j < Integer.MAX_VALUE; j++) {
+                        checkSumThreadSafeVersion("test");
+                    }
+                    countDownLatch.countDown();
+                }
+            });
+            thread.start();
+        }
+        countDownLatch.await();
+    }
+
+    private String checkSumThreadNotSafeVersion(String checkString) {
+        return new BigInteger(1, MESSAGE_DIGEST.digest((checkString).getBytes(Charset.forName("UTF-8")))).toString(16);
+    }
+
+    private String checkSumThreadSafeVersion(String checkString) {
+        return new BigInteger(1, MESSAGE_DIGEST_LOCAL.get().digest((checkString).getBytes(Charset.forName("UTF-8")))).toString(16);
+    }
+}