diff --git a/samples/sample_c/module_sample/camera_manager/test_camera_manager.c b/samples/sample_c/module_sample/camera_manager/test_camera_manager.c
index ea1e842b..4edf9f98 100644
--- a/samples/sample_c/module_sample/camera_manager/test_camera_manager.c
+++ b/samples/sample_c/module_sample/camera_manager/test_camera_manager.c
@@ -1303,7 +1303,7 @@ static T_DjiReturnCode DjiTest_CameraManagerMediaDownloadAndDeleteMediaFile(E_Dj
         for (int i = 0; i < downloadCount; ++i) {
             if (s_meidaFileList.fileListInfo[i].fileSize < 1 * 1024 * 1024) {
                 printf(
-                    "\033[1;32;40m ### Media file_%03d name: %s, index: %d, time:%04d-%02d-%02d_%02d:%02d:%02d, size: %.2f KB, type: %d \033[0m\r\n",
+                    "\033[1;32;40m ### Media file_%03d name: %s, index: %lu, time:%04d-%02d-%02d_%02d:%02d:%02d, size: %.2f KB, type: %d \033[0m\r\n",
                     i, s_meidaFileList.fileListInfo[i].fileName,
                     s_meidaFileList.fileListInfo[i].fileIndex,
                     s_meidaFileList.fileListInfo[i].createTime.year,
@@ -1316,7 +1316,7 @@ static T_DjiReturnCode DjiTest_CameraManagerMediaDownloadAndDeleteMediaFile(E_Dj
                     s_meidaFileList.fileListInfo[i].type);
             } else {
                 printf(
-                    "\033[1;32;40m ### Media file_%03d name: %s, index: %d, time:%04d-%02d-%02d_%02d:%02d:%02d, size: %.2f MB, type: %d \033[0m\r\n",
+                    "\033[1;32;40m ### Media file_%03d name: %s, index: %lu, time:%04d-%02d-%02d_%02d:%02d:%02d, size: %.2f MB, type: %d \033[0m\r\n",
                     i, s_meidaFileList.fileListInfo[i].fileName,
                     s_meidaFileList.fileListInfo[i].fileIndex,
                     s_meidaFileList.fileListInfo[i].createTime.year,
@@ -1394,7 +1394,7 @@ static T_DjiReturnCode DjiTest_CameraManagerMediaDownloadFileListBySlices(E_DjiM
         for (int i = 0; i < downloadCount; ++i) {
             if (s_meidaFileList.fileListInfo[i].fileSize < 1 * 1024 * 1024) {
                 printf(
-                    "\033[1;32;40m ### Media file_%03d name: %s, index: %d, time:%04d-%02d-%02d_%02d:%02d:%02d, size: %.2f KB, type: %d \033[0m\r\n",
+                    "\033[1;32;40m ### Media file_%03d name: %s, index: %lu, time:%04d-%02d-%02d_%02d:%02d:%02d, size: %.2f KB, type: %d \033[0m\r\n",
                     i, s_meidaFileList.fileListInfo[i].fileName,
                     s_meidaFileList.fileListInfo[i].fileIndex,
                     s_meidaFileList.fileListInfo[i].createTime.year,
@@ -1407,7 +1407,7 @@ static T_DjiReturnCode DjiTest_CameraManagerMediaDownloadFileListBySlices(E_DjiM
                     s_meidaFileList.fileListInfo[i].type);
             } else {
                 printf(
-                    "\033[1;32;40m ### Media file_%03d name: %s, index: %d, time:%04d-%02d-%02d_%02d:%02d:%02d, size: %.2f MB, type: %d \033[0m\r\n",
+                    "\033[1;32;40m ### Media file_%03d name: %s, index: %lu, time:%04d-%02d-%02d_%02d:%02d:%02d, size: %.2f MB, type: %d \033[0m\r\n",
                     i, s_meidaFileList.fileListInfo[i].fileName,
                     s_meidaFileList.fileListInfo[i].fileIndex,
                     s_meidaFileList.fileListInfo[i].createTime.year,
@@ -1463,7 +1463,7 @@ static T_DjiReturnCode DjiTest_CameraManagerDownloadFileDataCallback(T_DjiDownlo
         if (s_downloadMediaFile != NULL) {
             fwrite(data, 1, len, s_downloadMediaFile);
         }
-        printf("\033[1;32;40m ### [Complete rate : %0.1f%%] (%s), size: %d, fileIndex: %d\033[0m\r\n",
+        printf("\033[1;32;40m ### [Complete rate : %0.1f%%] (%s), size: %lu, fileIndex: %lu\033[0m\r\n",
                packetInfo.progressInPercent, downloadFileName, packetInfo.fileSize, packetInfo.fileIndex);
         printf("\033[1A");
         USER_LOG_DEBUG("Transfer download media file data, len: %d, percent: %.1f", len, packetInfo.progressInPercent);
@@ -1474,7 +1474,7 @@ static T_DjiReturnCode DjiTest_CameraManagerDownloadFileDataCallback(T_DjiDownlo
         osalHandler->GetTimeMs(&downloadEndMs);
 
         downloadSpeed = (float) packetInfo.fileSize / (float) (downloadEndMs - downloadStartMs);
-        printf("\033[1;32;40m ### [Complete rate : %0.1f%%] (%s), size: %d, fileIndex: %d\033[0m\r\n",
+        printf("\033[1;32;40m ### [Complete rate : %0.1f%%] (%s), size: %lu, fileIndex: %lu\033[0m\r\n",
                packetInfo.progressInPercent, downloadFileName, packetInfo.fileSize, packetInfo.fileIndex);
         printf("\033[1A");
         printf("\r\n");
diff --git a/samples/sample_c/module_sample/hms/test_hms.c b/samples/sample_c/module_sample/hms/test_hms.c
index 3ebbb164..0e6d0685 100644
--- a/samples/sample_c/module_sample/hms/test_hms.c
+++ b/samples/sample_c/module_sample/hms/test_hms.c
@@ -292,7 +292,7 @@ static bool DjiTest_MarchErrCodeInfoTable(T_DjiHmsInfoTable hmsInfoTable)
         for (int j = 0; j < sizeof(hmsErrCodeInfoTbl) / sizeof(T_DjiHmsErrCodeInfo); j++) {
             if (hmsInfoTable.hmsInfo[i].errorCode == hmsErrCodeInfoTbl[j].alarmId) {
                 hmsCodeMatchFlag = 1;
-                snprintf(alarmIdStr, sizeof(alarmIdStr), "%u", hmsInfoTable.hmsInfo[i].errorCode);
+                snprintf(alarmIdStr, sizeof(alarmIdStr), "%lu", hmsInfoTable.hmsInfo[i].errorCode);
                 //note:sensor_idx:[0,5].In order to be consistent with the display of pilot, add one.
                 snprintf(sensorIdStr, sizeof(sensorIdStr), "%d", hmsInfoTable.hmsInfo[i].componentIndex + 1);
                 snprintf(componentIdStr, sizeof(componentIdStr), "0x%02X", hmsInfoTable.hmsInfo[i].componentIndex + 1);
diff --git a/samples/sample_c/module_sample/mop_channel/test_mop_channel.c b/samples/sample_c/module_sample/mop_channel/test_mop_channel.c
index cca40f75..20e53080 100644
--- a/samples/sample_c/module_sample/mop_channel/test_mop_channel.c
+++ b/samples/sample_c/module_sample/mop_channel/test_mop_channel.c
@@ -493,7 +493,11 @@ static void *DjiTest_MopChannelFileServiceSendTask(void *arg)
                     USER_LOG_ERROR("Get file current path error, stat = 0x%08llX", returnCode);
                     exit(1);
                 }
-                snprintf(tempPath, DJI_FILE_PATH_SIZE_MAX, "%smop_channel_test_file/mop_send_test_file.mp4", curFileDirPath);
+                int pathLen = snprintf(tempPath, DJI_FILE_PATH_SIZE_MAX, "%smop_channel_test_file/mop_send_test_file.mp4", curFileDirPath);
+                if (pathLen < 0 || pathLen >= DJI_FILE_PATH_SIZE_MAX) {
+                    USER_LOG_ERROR("snprintf error, pathLen = %d", pathLen);
+                    exit(1);
+                }
 
                 downloadFile = fopen(tempPath, "rb");
                 if (downloadFile == NULL) {