diff --git a/weixin-java-mp/src/main/java/me/chanjar/weixin/mp/util/requestexecuter/material/MaterialDeleteOkhttpRequestExecutor.java b/weixin-java-mp/src/main/java/me/chanjar/weixin/mp/util/requestexecuter/material/MaterialDeleteOkhttpRequestExecutor.java
index 2f435ab460..15064413dd 100644
--- a/weixin-java-mp/src/main/java/me/chanjar/weixin/mp/util/requestexecuter/material/MaterialDeleteOkhttpRequestExecutor.java
+++ b/weixin-java-mp/src/main/java/me/chanjar/weixin/mp/util/requestexecuter/material/MaterialDeleteOkhttpRequestExecutor.java
@@ -1,24 +1,24 @@
 package me.chanjar.weixin.mp.util.requestexecuter.material;
 
-import java.io.IOException;
-
-import org.slf4j.Logger;
-import org.slf4j.LoggerFactory;
-
+import com.google.common.collect.ImmutableMap;
 import me.chanjar.weixin.common.WxType;
 import me.chanjar.weixin.common.error.WxError;
 import me.chanjar.weixin.common.error.WxErrorException;
 import me.chanjar.weixin.common.util.http.RequestHttp;
 import me.chanjar.weixin.common.util.http.ResponseHandler;
 import me.chanjar.weixin.common.util.http.okhttp.OkHttpProxyInfo;
-import okhttp3.FormBody;
-import okhttp3.OkHttpClient;
-import okhttp3.Request;
-import okhttp3.RequestBody;
-import okhttp3.Response;
+import me.chanjar.weixin.common.util.json.WxGsonBuilder;
+import okhttp3.*;
+import org.slf4j.Logger;
+import org.slf4j.LoggerFactory;
+
+import java.io.IOException;
 
 /**
- * Created by ecoolper on 2017/5/5.
+ * .
+ *
+ * @author ecoolper
+ * @date 2017/5/5
  */
 public class MaterialDeleteOkhttpRequestExecutor extends MaterialDeleteRequestExecutor<OkHttpClient, OkHttpProxyInfo> {
   private final Logger logger = LoggerFactory.getLogger(this.getClass());
@@ -28,25 +28,25 @@ public MaterialDeleteOkhttpRequestExecutor(RequestHttp requestHttp) {
   }
 
   @Override
-  public void execute(String uri, String data, ResponseHandler<Boolean> handler, WxType wxType) throws WxErrorException, IOException {
+  public void execute(String uri, String data, ResponseHandler<Boolean> handler, WxType wxType)
+    throws WxErrorException, IOException {
     handler.handle(this.execute(uri, data, wxType));
   }
 
   @Override
   public Boolean execute(String uri, String materialId, WxType wxType) throws WxErrorException, IOException {
     logger.debug("MaterialDeleteOkhttpRequestExecutor is running");
-    //得到httpClient
-    OkHttpClient client = requestHttp.getRequestHttpClient();
 
-    RequestBody requestBody = new FormBody.Builder().add("media_id", materialId).build();
+    RequestBody requestBody = RequestBody.create(MediaType.parse("application/json"),
+      WxGsonBuilder.create().toJson(ImmutableMap.of("media_id", materialId)));
     Request request = new Request.Builder().url(uri).post(requestBody).build();
-    Response response = client.newCall(request).execute();
+    Response response = requestHttp.getRequestHttpClient().newCall(request).execute();
     String responseContent = response.body().string();
     WxError error = WxError.fromJson(responseContent, WxType.MP);
     if (error.getErrorCode() != 0) {
       throw new WxErrorException(error);
-    } else {
-      return true;
     }
+
+    return true;
   }
 }
diff --git a/weixin-java-mp/src/main/java/me/chanjar/weixin/mp/util/requestexecuter/material/MaterialNewsInfoOkhttpRequestExecutor.java b/weixin-java-mp/src/main/java/me/chanjar/weixin/mp/util/requestexecuter/material/MaterialNewsInfoOkhttpRequestExecutor.java
index d8b07737a8..9a0b2c68b2 100644
--- a/weixin-java-mp/src/main/java/me/chanjar/weixin/mp/util/requestexecuter/material/MaterialNewsInfoOkhttpRequestExecutor.java
+++ b/weixin-java-mp/src/main/java/me/chanjar/weixin/mp/util/requestexecuter/material/MaterialNewsInfoOkhttpRequestExecutor.java
@@ -28,13 +28,11 @@ public MaterialNewsInfoOkhttpRequestExecutor(RequestHttp requestHttp) {
 
   @Override
   public WxMpMaterialNews execute(String uri, String materialId, WxType wxType) throws WxErrorException, IOException {
-    OkHttpClient client = requestHttp.getRequestHttpClient();
-
     RequestBody requestBody = RequestBody.create(MediaType.parse("application/json"),
       WxGsonBuilder.create().toJson(ImmutableMap.of("media_id", materialId)));
     Request request = new Request.Builder().url(uri).post(requestBody).build();
 
-    Response response = client.newCall(request).execute();
+    Response response = requestHttp.getRequestHttpClient().newCall(request).execute();
     String responseContent = response.body().string();
     log.debug("响应原始数据：{}", responseContent);
 
diff --git a/weixin-java-mp/src/main/java/me/chanjar/weixin/mp/util/requestexecuter/material/MaterialUploadOkhttpRequestExecutor.java b/weixin-java-mp/src/main/java/me/chanjar/weixin/mp/util/requestexecuter/material/MaterialUploadOkhttpRequestExecutor.java
index 5a651427b5..9f034def9c 100644
--- a/weixin-java-mp/src/main/java/me/chanjar/weixin/mp/util/requestexecuter/material/MaterialUploadOkhttpRequestExecutor.java
+++ b/weixin-java-mp/src/main/java/me/chanjar/weixin/mp/util/requestexecuter/material/MaterialUploadOkhttpRequestExecutor.java
@@ -38,8 +38,6 @@ public WxMpMaterialUploadResult execute(String uri, WxMpMaterial material, WxTyp
       throw new FileNotFoundException();
     }
 
-    //得到httpClient
-
     OkHttpClient client = requestHttp.getRequestHttpClient();
 
     MultipartBody.Builder bodyBuilder = new MultipartBody.Builder()
diff --git a/weixin-java-mp/src/main/java/me/chanjar/weixin/mp/util/requestexecuter/material/MaterialVideoInfoOkhttpRequestExecutor.java b/weixin-java-mp/src/main/java/me/chanjar/weixin/mp/util/requestexecuter/material/MaterialVideoInfoOkhttpRequestExecutor.java
index edcc527756..b626fe930a 100644
--- a/weixin-java-mp/src/main/java/me/chanjar/weixin/mp/util/requestexecuter/material/MaterialVideoInfoOkhttpRequestExecutor.java
+++ b/weixin-java-mp/src/main/java/me/chanjar/weixin/mp/util/requestexecuter/material/MaterialVideoInfoOkhttpRequestExecutor.java
@@ -1,10 +1,12 @@
 package me.chanjar.weixin.mp.util.requestexecuter.material;
 
+import com.google.common.collect.ImmutableMap;
 import me.chanjar.weixin.common.WxType;
 import me.chanjar.weixin.common.error.WxError;
 import me.chanjar.weixin.common.error.WxErrorException;
 import me.chanjar.weixin.common.util.http.RequestHttp;
 import me.chanjar.weixin.common.util.http.okhttp.OkHttpProxyInfo;
+import me.chanjar.weixin.common.util.json.WxGsonBuilder;
 import me.chanjar.weixin.mp.bean.material.WxMpMaterialVideoInfoResult;
 import okhttp3.*;
 import org.slf4j.Logger;
@@ -25,12 +27,11 @@ public MaterialVideoInfoOkhttpRequestExecutor(RequestHttp requestHttp) {
   @Override
   public WxMpMaterialVideoInfoResult execute(String uri, String materialId, WxType wxType) throws WxErrorException, IOException {
     logger.debug("MaterialVideoInfoOkhttpRequestExecutor is running");
-    //得到httpClient
-    OkHttpClient client = requestHttp.getRequestHttpClient();
 
-    RequestBody requestBody = new FormBody.Builder().add("media_id", materialId).build();
+    RequestBody requestBody = RequestBody.create(MediaType.parse("application/json"),
+      WxGsonBuilder.create().toJson(ImmutableMap.of("media_id", materialId)));
     Request request = new Request.Builder().url(uri).post(requestBody).build();
-    Response response = client.newCall(request).execute();
+    Response response = requestHttp.getRequestHttpClient().newCall(request).execute();
     String responseContent = response.body().string();
     WxError error = WxError.fromJson(responseContent, WxType.MP);
     if (error.getErrorCode() != 0) {
diff --git a/weixin-java-mp/src/main/java/me/chanjar/weixin/mp/util/requestexecuter/material/MaterialVoiceAndImageDownloadOkhttpRequestExecutor.java b/weixin-java-mp/src/main/java/me/chanjar/weixin/mp/util/requestexecuter/material/MaterialVoiceAndImageDownloadOkhttpRequestExecutor.java
index 5c0ddb6a83..39869b6cbb 100644
--- a/weixin-java-mp/src/main/java/me/chanjar/weixin/mp/util/requestexecuter/material/MaterialVoiceAndImageDownloadOkhttpRequestExecutor.java
+++ b/weixin-java-mp/src/main/java/me/chanjar/weixin/mp/util/requestexecuter/material/MaterialVoiceAndImageDownloadOkhttpRequestExecutor.java
@@ -1,10 +1,12 @@
 package me.chanjar.weixin.mp.util.requestexecuter.material;
 
+import com.google.common.collect.ImmutableMap;
 import me.chanjar.weixin.common.WxType;
 import me.chanjar.weixin.common.error.WxError;
 import me.chanjar.weixin.common.error.WxErrorException;
 import me.chanjar.weixin.common.util.http.RequestHttp;
 import me.chanjar.weixin.common.util.http.okhttp.OkHttpProxyInfo;
+import me.chanjar.weixin.common.util.json.WxGsonBuilder;
 import okhttp3.*;
 import okio.BufferedSink;
 import okio.Okio;
@@ -27,7 +29,9 @@ public MaterialVoiceAndImageDownloadOkhttpRequestExecutor(RequestHttp requestHtt
   public InputStream execute(String uri, String materialId, WxType wxType) throws WxErrorException, IOException {
     logger.debug("MaterialVoiceAndImageDownloadOkhttpRequestExecutor is running");
     OkHttpClient client = requestHttp.getRequestHttpClient();
-    RequestBody requestBody = new FormBody.Builder().add("media_id", materialId).build();
+
+    RequestBody requestBody = RequestBody.create(MediaType.parse("application/json"),
+      WxGsonBuilder.create().toJson(ImmutableMap.of("media_id", materialId)));
     Request request = new Request.Builder().url(uri).get().post(requestBody).build();
     Response response = client.newCall(request).execute();
     String contentTypeHeader = response.header("Content-Type");
@@ -35,6 +39,7 @@ public InputStream execute(String uri, String materialId, WxType wxType) throws
       String responseContent = response.body().string();
       throw new WxErrorException(WxError.fromJson(responseContent, WxType.MP));
     }
+
     try (ByteArrayOutputStream outputStream = new ByteArrayOutputStream(); BufferedSink sink = Okio.buffer(Okio.sink(outputStream))) {
       sink.writeAll(response.body().source());
       return new ByteArrayInputStream(outputStream.toByteArray());
diff --git a/weixin-java-mp/src/test/java/me/chanjar/weixin/mp/api/impl/WxMpMaterialServiceImplTest.java b/weixin-java-mp/src/test/java/me/chanjar/weixin/mp/api/impl/WxMpMaterialServiceImplTest.java
index afca1a2acf..024697cb70 100644
--- a/weixin-java-mp/src/test/java/me/chanjar/weixin/mp/api/impl/WxMpMaterialServiceImplTest.java
+++ b/weixin-java-mp/src/test/java/me/chanjar/weixin/mp/api/impl/WxMpMaterialServiceImplTest.java
@@ -9,16 +9,16 @@
 import me.chanjar.weixin.mp.api.test.ApiTestModule;
 import me.chanjar.weixin.mp.api.test.TestConstants;
 import me.chanjar.weixin.mp.bean.material.*;
-import org.testng.annotations.*;
+import org.testng.annotations.DataProvider;
+import org.testng.annotations.Guice;
+import org.testng.annotations.Test;
 
 import java.io.File;
 import java.io.IOException;
 import java.io.InputStream;
 import java.util.*;
 
-import static org.testng.Assert.assertEquals;
-import static org.testng.Assert.assertNotNull;
-import static org.testng.Assert.assertTrue;
+import static org.testng.Assert.*;
 
 /**
  * 素材管理相关接口的测试
@@ -27,7 +27,7 @@
  * @author codepiano
  * @author Binary Wang
  */
-@Test(groups = "materialAPI")
+@Test
 @Guice(modules = ApiTestModule.class)
 public class WxMpMaterialServiceImplTest {
   @Inject
@@ -175,7 +175,7 @@ public void testDownloadMaterial(String mediaId) throws WxErrorException, IOExce
     }
   }
 
-  @Test(dependsOnMethods = {"testAddNews","testUploadMaterial"})
+  @Test(dependsOnMethods = {"testAddNews", "testUploadMaterial"})
   public void testGetNewsInfo() throws WxErrorException {
     WxMpMaterialNews wxMpMaterialNewsSingle = this.wxService
       .getMaterialService().materialNewsInfo(this.singleNewsMediaId);
@@ -243,6 +243,15 @@ public void testMaterialFileList() throws WxErrorException {
 
   @Test(dependsOnMethods = {"testMaterialFileList"}, dataProvider = "allTestMaterial")
   public void testDeleteMaterial(String mediaId) throws WxErrorException {
+    this.delete(mediaId);
+  }
+
+  @Test
+  public void testDeleteMaterialDirectly() throws WxErrorException {
+    this.delete("abc");
+  }
+
+  public void delete(String mediaId) throws WxErrorException {
     boolean result = this.wxService.getMaterialService().materialDelete(mediaId);
     assertTrue(result);
   }