diff --git a/kal/timer/src/kal.c b/kal/timer/src/kal.c
index 2ee83c4df5302b0e6924c88267fc67bf2406f292..7693e67db514a306726eb95d8b03861a45c9821e 100755
--- a/kal/timer/src/kal.c
+++ b/kal/timer/src/kal.c
@@ -143,12 +143,9 @@ KalErrCode KalTimerDelete(KalTimerId timerId)
     }
     KalTimer* tmpPtr = (KalTimer *)timerId;
     int ret = timer_delete(tmpPtr->timerPtr);
-    if (ret != 0) {
-        free(timerId);
-        return KAL_ERR_INNER;
-    }
     free(timerId);
-    return KAL_OK;
+    timerId = NULL;
+    return (ret != 0) ? KAL_ERR_INNER : KAL_OK;
 }
 
 unsigned int KalTimerIsRunning(KalTimerId timerId)
diff --git a/kv_store/src/kvstore_impl_hal/kv_store.c b/kv_store/src/kvstore_impl_hal/kv_store.c
index 976dbd4c7f1b6b3f69fa974c06dcc72858368259..3711e375f9778e2c658e6a07b9cc852f35f2a7ef 100755
--- a/kv_store/src/kvstore_impl_hal/kv_store.c
+++ b/kv_store/src/kvstore_impl_hal/kv_store.c
@@ -40,11 +40,12 @@ static int GetValueByFile(const char* key, char* value, unsigned int len)
     if (fd < 0) {
         return EC_FAILURE;
     }
-    if (UtilsFileRead(fd, value, valueLen) < 0) {
-        UtilsFileClose(fd);
+    int ret = UtilsFileRead(fd, value, valueLen);
+    UtilsFileClose(fd);
+    fd = -1;
+    if (ret < 0) {
         return EC_FAILURE;
     }
-    UtilsFileClose(fd);
     value[valueLen] = '\0';
     return valueLen;
 }
@@ -55,12 +56,10 @@ static int SetValueToFile(const char* key, const char* value)
     if (fd < 0) {
         return EC_FAILURE;
     }
-    if (UtilsFileWrite(fd, value, strlen(value)) < 0) {
-        UtilsFileClose(fd);
-        return EC_FAILURE;
-    }
+    int ret = UtilsFileWrite(fd, value, strlen(value);
     UtilsFileClose(fd);
-    return EC_SUCCESS;
+    fd = -1;
+    return (ret < 0) ? EC_FAILURE : EC_SUCCESS;
 }
 
 static int GetCurrentItem(void)
@@ -70,13 +69,10 @@ static int GetCurrentItem(void)
         return 0;
     }
     char value[KV_SUM_INDEX] = {0};
-    if (UtilsFileRead(fd, value, KV_SUM_INDEX) < 0) {
-        UtilsFileClose(fd);
-        return 0;
-    }
+    int ret = UtilsFileRead(fd, value, KV_SUM_INDEX);
     UtilsFileClose(fd);
-    int sum = atoi(value);
-    return sum;
+    fd = -1;
+    return (ret < 0) ? 0 : atoi(value);
 }
 
 static int SetCurrentItem(const int num)
@@ -89,12 +85,11 @@ static int SetCurrentItem(const int num)
     if (fd < 0) {
         return EC_FAILURE;
     }
-    if (UtilsFileWrite(fd, value, KV_SUM_INDEX) < 0) {
-        UtilsFileClose(fd);
-        return EC_FAILURE;
-    }
+
+    int ret = UtilsFileWrite(fd, value, KV_SUM_INDEX);
     UtilsFileClose(fd);
-    return EC_SUCCESS;
+    fd = -1;
+    return (ret < 0) ? EC_FAILURE : EC_SUCCESS;
 }
 
 static boolean NewItem(const char* key)
@@ -159,10 +154,8 @@ int UtilsDeleteValue(const char* key)
     DeleteKVCache(key);
 #endif
     int ret = UtilsFileDelete(key);
-    int currentNum = GetCurrentItem();
     if (ret == EC_SUCCESS) {
-        currentNum--;
-        ret = SetCurrentItem(currentNum);
+        ret = SetCurrentItem(GetCurrentItem() - 1);
     }
     return ret;
 }
diff --git a/kv_store/src/kvstore_impl_posix/kv_store.c b/kv_store/src/kvstore_impl_posix/kv_store.c
index bfa7cdc9b13410e41db605c9a9549dc024f48c08..9a3bf99716f4d208a99415ba99fdba8eeec43094 100755
--- a/kv_store/src/kvstore_impl_posix/kv_store.c
+++ b/kv_store/src/kvstore_impl_posix/kv_store.c
@@ -86,12 +86,12 @@ static int GetValueByFile(const char* dataPath, const char* key, char* value, un
     if (fd < 0) {
         return EC_FAILURE;
     }
-    if (read(fd, value, info.st_size) < 0) {
-        close(fd);
-        return EC_FAILURE;
-    }
+    int ret = read(fd, value, info.st_size);
     close(fd);
     fd = -1;
+    if (ret < 0) {
+        return EC_FAILURE;
+    }
     value[info.st_size] = '\0';
     return info.st_size;
 }
@@ -112,12 +112,10 @@ static int SetValueToFile(const char* dataPath, const char* key, const char* val
     if (fd < 0) {
         return EC_FAILURE;
     }
-    if (write(fd, value, strlen(value)) < 0) {
-        close(fd);
-        return EC_FAILURE;
-    }
+    int ret = write(fd, value, strlen(value);
     close(fd);
-    return EC_SUCCESS;
+    fd = -1;
+    return (ret < 0) ? EC_FAILURE : EC_SUCCESS;
 }
 
 static int DeleteValueFromFile(const char* dataPath, const char* key)
@@ -317,10 +315,7 @@ int UtilsSetEnv(const char* path)
         return EC_FAILURE;
     }
     pthread_mutex_lock(&g_kvGlobalMutex);
-    if (strcpy_s(g_dataPath, MAX_KEY_PATH + 1, path) != EOK) {
-        pthread_mutex_unlock(&g_kvGlobalMutex);
-        return EC_FAILURE;
-    }
+    int ret = strcpy_s(g_dataPath, MAX_KEY_PATH + 1, path);
     pthread_mutex_unlock(&g_kvGlobalMutex);
-    return EC_SUCCESS;
+    return (ret != EOK) ? EC_FAILURE : EC_SUCCESS;
 }
\ No newline at end of file