diff --git a/README.md b/README.md
index 8d1322b3c61fde86e054684a367b286aa900715b..b23ab4be75265f04a67519c3b3fb66e9fad91f68 100755
--- a/README.md
+++ b/README.md
@@ -73,7 +73,7 @@ utils/native/lite/              # Root directory
 ├── include                     # Header files of external APIs
 ├── js                          # JavaScript APIs
 │   └── builtin
-│       ├── common
+│       ├── common              # Builtin common function
 │       ├── deviceinfokit       # Device information kit
 │       ├── filekit             # File kit
 │       └── kvstorekit          # KV store kit
diff --git a/README_zh.md b/README_zh.md
index b13b99b4295ce106d8fed687d37bc3a596d0b007..eb31faf75f3dff41568c8fe07ce776fe847b7000 100755
--- a/README_zh.md
+++ b/README_zh.md
@@ -57,7 +57,7 @@
 </td>
 <td class="cellrowborder" valign="top" width="24.77%" headers="mcps1.2.4.1.2 "><p id="zh-cn_topic_0000001052623010_p16300204280"><a name="zh-cn_topic_0000001052623010_p16300204280"></a><a name="zh-cn_topic_0000001052623010_p16300204280"></a>LiteOS-M内核、LiteOS-A内核</p>
 </td>
-<td class="cellrowborder" valign="top" width="54.010000000000005%" headers="mcps1.2.4.1.3 "><p id="zh-cn_topic_0000001052623010_p1563018208286"><a name="zh-cn_topic_0000001052623010_p1563018208286"></a><a name="zh-cn_topic_0000001052623010_p1563018208286"></a>提供dump系统属性的命令行工具。</p>
+<td class="cellrowborder" valign="top" width="54.010000000000005%" headers="mcps1.2.4.1.3 "><p id="zh-cn_topic_0000001052623010_p1563018208286"><a name="zh-cn_topic_0000001052623010_p1563018208286"></a><a name="zh-cn_topic_0000001052623010_p1563018208286"></a>提供Dump系统属性的命令行工具。</p>
 </td>
 </tr>
 </tbody>
@@ -73,7 +73,7 @@ utils/native/lite/              # 公共基础库根目录
 ├── include                     # 公共基础库对外接口文件
 ├── js                          # JS API目录                 
 │   └── builtin
-│       ├── common
+│       ├── common              # Builtin公共函数
 │       ├── deviceinfokit       # 设备信息Kit
 │       ├── filekit             # 文件Kit
 │       └── kvstorekit          # KV存储Kit
diff --git a/os_dump/os_dump.c b/os_dump/os_dump.c
index c3946a24f2fb7915d64df8d6ad028648cc23d893..f2a40da08292f650d817582d3aaeedfe456d4384 100644
--- a/os_dump/os_dump.c
+++ b/os_dump/os_dump.c
@@ -31,7 +31,7 @@ static const ServiceItem SERVICE_LIST[] = {
 
 static void Usage()
 {
-    printf("usage os_dump [--help | -l | SERVICE]\n"
+    printf("Usage:os_dump [--help | -l | SERVICE]\n"
         "         --help: shows this help\n"
         "         -l: only list services, do not dump them\n"
         "         SERVICE: dumps only service SERVICE\n");
diff --git a/timer_task/include/nativeapi_timer_task.h b/timer_task/include/nativeapi_timer_task.h
index ba598e9e2c82f6bcdaee0636698b51bc2a90d2fb..c81a7e9cff2717efda4970db8d6cf5cdb359ad91 100755
--- a/timer_task/include/nativeapi_timer_task.h
+++ b/timer_task/include/nativeapi_timer_task.h
@@ -24,7 +24,7 @@ extern "C" {
 #endif
 #endif /* __cplusplus */
 
-typedef void *timerHandle_t;
+typedef void* timerHandle_t;
 
 int InitTimerTask();
 int StartTimerTask(bool isPeriodic, const unsigned int delay, void* userCallback,