diff --git a/src/client/src/tscSystem.c b/src/client/src/tscSystem.c
index f65e845e497f090a6f97992267c7cd6dc625f0ea..4e3db7b4f1062f1c248ad9f6fec6e726f3b56963 100644
--- a/src/client/src/tscSystem.c
+++ b/src/client/src/tscSystem.c
@@ -439,30 +439,49 @@ int taos_options(TSDB_OPTION option, const void *arg, ...) {
 }
 
 #include "cJSON.h"
-static int taos_set_config_imp(const char *config){
+static setConfRet taos_set_config_imp(const char *config){
+  setConfRet ret = {0};
   static bool setConfFlag = false;
   if (setConfFlag) {
-    return 0;
+    ret.retCode = -5;
+    strcpy(ret.retMsg, "configuration can only set once");
+    return ret;
   }
   taosInitGlobalCfg();
   cJSON *root = cJSON_Parse(config);
-  if (root == NULL || !cJSON_IsObject(root) || cJSON_GetArraySize(root) == 0) {
-    return -1;
+  if (root == NULL){
+    ret.retCode = -4;
+    strcpy(ret.retMsg, "parse json error");
+    return ret;
+  }
+  if(!cJSON_IsObject(root) || cJSON_GetArraySize(root) == 0) {
+    ret.retCode = -3;
+    strcpy(ret.retMsg, "json content is invalid, must be not empty object");
+    return ret;
   }
 
-  int ret = 0;
   int size = cJSON_GetArraySize(root);
   for(int i = 0; i < size; i++){
     cJSON *item = cJSON_GetArrayItem(root, i);
-    if(item && !taosReadConfigOption(item->string, item->valuestring, NULL, NULL, TAOS_CFG_CSTATUS_OPTION, TSDB_CFG_CTYPE_B_CLIENT)){
-      ret = -2;
+    if(!item) {
+      ret.retCode = -2;
+      strcpy(ret.retMsg, "inner error");
+      return ret;
+    }
+    if(!taosReadConfigOption(item->string, item->valuestring, NULL, NULL, TAOS_CFG_CSTATUS_OPTION, TSDB_CFG_CTYPE_B_CLIENT)){
+      ret.retCode = -1;
+      if (strlen(ret.retMsg) == 0){
+        sprintf(ret.retMsg, "part error|%s", item->string);
+      }else{
+        sprintf(ret.retMsg, "%s|%s", ret.retMsg, item->string);
+      }
     }
   }
   setConfFlag = true;
   return ret;
 }
 
-int taos_set_config(const char *config){
+setConfRet taos_set_config(const char *config){
   static int32_t lock = 0;
 
   for (int i = 1; atomic_val_compare_exchange_32(&lock, 0, 1) != 0; ++i) {
@@ -471,7 +490,7 @@ int taos_set_config(const char *config){
       sched_yield();
     }
   }
-  int ret = taos_set_config_imp(config);
+  setConfRet ret = taos_set_config_imp(config);
   atomic_store_32(&lock, 0);
   return ret;
 }
diff --git a/src/client/tests/setConfigTest.cpp b/src/client/tests/setConfigTest.cpp
index e7c34ed8f161467bf394531aff7fa426210aa21c..9b982741b78e05a01c7f634c80f2001ccdef0418 100644
--- a/src/client/tests/setConfigTest.cpp
+++ b/src/client/tests/setConfigTest.cpp
@@ -8,10 +8,14 @@
 /* test set config function */
 TEST(testCase, set_config_test1) {
   const char *config = "{\"debugFlag\":\"131\"}";
-  taos_set_config(config);
+  setConfRet ret = taos_set_config(config);
+  ASSERT_EQ(ret.retCode, 0);
+  printf("msg:%d->%s", ret.retCode, ret.retMsg);
 
   const char *config2 = "{\"debugFlag\":\"199\"}";
-  taos_set_config(config2);  // not take effect
+  ret = taos_set_config(config2);  // not take effect
+  ASSERT_EQ(ret.retCode, -5)
+  printf("msg:%d->%s", ret.retCode, ret.retMsg);
 
   bool readResult = taosReadGlobalCfg();  // load file config, debugFlag not take effect
   ASSERT_TRUE(readResult);
@@ -37,3 +41,24 @@ TEST(testCase, set_config_test2) {
   int32_t result = *(int32_t*)cfg->ptr;
   ASSERT_NE(result, 10);    // numOfCommitThreads not type of TSDB_CFG_CTYPE_B_CLIENT
 }
+
+TEST(testCase, set_config_test3) {
+  const char *config = "{\"numOfCoitThreads\":\"10\", \"esdfa\":\"10\"}";
+  setConfRet ret = taos_set_config(config);
+  ASSERT_EQ(ret.retCode, -1);
+  printf("msg:%d->%s", ret.retCode, ret.retMsg);
+}
+
+TEST(testCase, set_config_test4) {
+  const char *config = "{null}";
+  setConfRet ret = taos_set_config(config);
+  ASSERT_EQ(ret.retCode, -4);
+  printf("msg:%d->%s", ret.retCode, ret.retMsg);
+}
+
+TEST(testCase, set_config_test5) {
+  const char *config = "ddd";
+  setConfRet ret = taos_set_config(config);
+  ASSERT_EQ(ret.retCode, -3);
+  printf("msg:%d->%s", ret.retCode, ret.retMsg);
+}
diff --git a/src/inc/taos.h b/src/inc/taos.h
index 107dbc2826bb022bacd48c57351bc8a699afa4c5..d77fa8f5fcb4c957c274d076a1d6f2ef5631c85a 100644
--- a/src/inc/taos.h
+++ b/src/inc/taos.h
@@ -62,6 +62,11 @@ typedef struct taosField {
   int16_t  bytes;
 } TAOS_FIELD;
 
+typedef struct setConfRet {
+  char   retMsg[1024];
+  int8_t retCode;
+} setConfRet;
+
 #ifdef _TD_GO_DLL_
   #define DLL_EXPORT    __declspec(dllexport)
 #else
@@ -71,7 +76,7 @@ typedef struct taosField {
 DLL_EXPORT int  taos_init();
 DLL_EXPORT void  taos_cleanup(void);
 DLL_EXPORT int   taos_options(TSDB_OPTION option, const void *arg, ...);
-DLL_EXPORT int   taos_set_config(const char *config);
+DLL_EXPORT setConfRet   taos_set_config(const char *config);
 DLL_EXPORT TAOS *taos_connect(const char *ip, const char *user, const char *pass, const char *db, uint16_t port);
 DLL_EXPORT TAOS *taos_connect_auth(const char *ip, const char *user, const char *auth, const char *db, uint16_t port);
 DLL_EXPORT void  taos_close(TAOS *taos);