diff --git a/README_zh.md b/README_zh.md
index c2a6b5fb8c0e5cbf763e3d6ff2fa74dc1a797644..a89935c5921be59c568c5b49b693145723375f14 100644
--- a/README_zh.md
+++ b/README_zh.md
@@ -47,16 +47,14 @@
 
 ## 接口说明<a name="section1312121216216"></a>
 
-设备认证组件中，设备群组管理服务负责将不同业务建立的设备间可信关系抽象成一个个可信群组，对外提供统一的接口，包含群组创建、删除、查询等功能；设备群组认证服务基于已经建立过可信关系的设备群组，提供设备可信认证与端到端会话密钥协商功能。
-
 **表 2**  数据传输管控提供的API接口功能介绍
 
 | 接口名                                                       | 描述                                   |
 | ------------------------------------------------------------ | -------------------------------------- |
 | int32_t DATASL_GetHighestSecLevel(DEVSLQueryParams *queryParams, uint32_t *levelInfo); | 获取对应设备可支持的数据风险等级。     |
 | int32_t DATASL_GetHighestSecLevelAsync(DEVSLQueryParams *queryParams, HigestSecInfoCallback *callback); | 异步获取对应设备可支持的数据风险等级。 |
-| int32_t DATASL_OnStart(void);                                | 模块初始化                             |
-| void DATASL_OnStop(void);                                    | 模块去初始化                           |
+| int32_t DATASL_OnStart(void);                                | 模块初始化。                           |
+| void DATASL_OnStop(void);                                    | 模块去初始化。                         |
 
 
 
diff --git a/frameworks/datatransmitmgr/dev_slinfo_adpt.c b/frameworks/datatransmitmgr/dev_slinfo_adpt.c
index e332f03b8fa1824421068424cc805e5102035d9e..51ea95b28841f69fb650955bee6d88d42ef24679 100644
--- a/frameworks/datatransmitmgr/dev_slinfo_adpt.c
+++ b/frameworks/datatransmitmgr/dev_slinfo_adpt.c
@@ -277,13 +277,13 @@ int32_t CompareUdid(DEVSLQueryParams *queryParamsL, DEVSLQueryParams *queryParam
     return DEVSL_SUCCESS;
 }
 
-int32_t GetDataSecLevelByDevSecLevel(int32_t devLevel)
+uint32_t GetDataSecLevelByDevSecLevel(int32_t devLevel)
 {
     int32_t i;
     int32_t n;
     struct {
         int32_t devSecLevel;
-        int32_t dataSecLevel;
+        uint32_t dataSecLevel;
     } devTypeMap[] = {
         { DEV_SEC_LEVEL1, DATA_SEC_LEVEL1 },
         { DEV_SEC_LEVEL2, DATA_SEC_LEVEL2 },
@@ -309,7 +309,7 @@ int32_t UpdateCallbackListParams(DEVSLQueryParams *queryParams, HigestSecInfoCal
     DATA_SEC_LOG_INFO("Enter UpdateCallbackListParams...");
     int32_t ret;
     int32_t result = DEVSL_ERR_REQUEST_DEVICE_EXCEED_LIMIT;
-    int32_t levelInfo = DEFAULT_DEV_SEC_LEVEL;
+    uint32_t levelInfo = DEFAULT_DEV_SEC_LEVEL;
 
     struct DATASLCallbackParams *newListNode =
         (struct DATASLCallbackParams*)malloc(sizeof(struct DATASLCallbackParams));
diff --git a/frameworks/datatransmitmgr/dev_slinfo_mgr.c b/frameworks/datatransmitmgr/dev_slinfo_mgr.c
index cad497643b462e4283f932aa62e941844fd780f3..5861c2f1945806222692644473b9bb175d8a9529 100644
--- a/frameworks/datatransmitmgr/dev_slinfo_mgr.c
+++ b/frameworks/datatransmitmgr/dev_slinfo_mgr.c
@@ -23,7 +23,7 @@ extern "C" {
 
 #define DATASL_API __attribute__ ((visibility ("default")))
 
-static int32_t GetHigestSecLevelByUdid(DEVSLQueryParams *queryParams, uint32_t *dataLevel)
+static int32_t GetHighestSecLevelByUdid(DEVSLQueryParams *queryParams, uint32_t *dataLevel)
 {
     int32_t ret;
     int32_t devLevel = DEFAULT_DEV_SEC_LEVEL;
@@ -35,7 +35,7 @@ static int32_t GetHigestSecLevelByUdid(DEVSLQueryParams *queryParams, uint32_t *
     ret = GetDeviceSecLevelByUdid(queryParams->udid, queryParams->udidLen, &devLevel);
     if (ret != DEVSL_SUCCESS) {
         *dataLevel = DATA_SEC_LEVEL0;
-        DATA_SEC_LOG_ERROR("GetHigestSecLevelByUdid: get device security level failed, error code: %d", ret);
+        DATA_SEC_LOG_ERROR("GetHighestSecLevelByUdid: get device security level failed, error code: %d", ret);
         return ret;
     }
 
@@ -68,13 +68,13 @@ DATASL_API void DATASL_OnStop(void)
 
 DATASL_API int32_t DATASL_GetHighestSecLevel(DEVSLQueryParams *queryParams, uint32_t *levelInfo)
 {
-    int32_t ret = 0;
+    int32_t ret;
     DATA_SEC_LOG_INFO("Enter DATASL_GetHighestSecLevel...");
     if ((queryParams == NULL) || (levelInfo == NULL)) {
         return DEVSL_ERR_BAD_PARAMETERS;
     }
 
-    ret = GetHigestSecLevelByUdid(queryParams, levelInfo);
+    ret = GetHighestSecLevelByUdid(queryParams, levelInfo);
 
     DATA_SEC_LOG_INFO("DATASL_GetHighestSecLevel done!");
     return ret;
diff --git a/interfaces/innerkits/datatransmitmgr/include/dev_slinfo_adpt.h b/interfaces/innerkits/datatransmitmgr/include/dev_slinfo_adpt.h
index 437225c3a6138a72fae2209e02d4c4b362f1a451..9ecbef874898ece569aa1a11f4cfe40b05f22ae8 100644
--- a/interfaces/innerkits/datatransmitmgr/include/dev_slinfo_adpt.h
+++ b/interfaces/innerkits/datatransmitmgr/include/dev_slinfo_adpt.h
@@ -60,7 +60,7 @@ int32_t CompareUdid(DEVSLQueryParams *queryParamsL, DEVSLQueryParams *queryParam
 
 int32_t GetDeviceSecLevelByUdidAsync(const uint8_t *udid, uint32_t udidLen);
 
-int32_t GetDataSecLevelByDevSecLevel(int32_t devLevel);
+uint32_t GetDataSecLevelByDevSecLevel(int32_t devLevel);
 
 int32_t UpdateCallbackListParams(DEVSLQueryParams *queryParams, HigestSecInfoCallback *callback);