diff --git a/source/libs/sync/src/syncMain.c b/source/libs/sync/src/syncMain.c
index 4aca68fa64aa54b01d8e7455ce22f55351974939..d128ed48b462ff7e8901a12df13451ef5b737136 100644
--- a/source/libs/sync/src/syncMain.c
+++ b/source/libs/sync/src/syncMain.c
@@ -349,7 +349,9 @@ int32_t syncPropose(int64_t rid, const SRpcMsg* pMsg, bool isWeak) {
 }
 
 // open/close --------------
-SSyncNode* syncNodeOpen(const SSyncInfo* pSyncInfo) {
+SSyncNode* syncNodeOpen(const SSyncInfo* pOldSyncInfo) {
+  SSyncInfo* pSyncInfo = (SSyncInfo*)pOldSyncInfo;
+
   SSyncNode* pSyncNode = (SSyncNode*)taosMemoryMalloc(sizeof(SSyncNode));
   assert(pSyncNode != NULL);
   memset(pSyncNode, 0, sizeof(SSyncNode));
@@ -361,11 +363,25 @@ SSyncNode* syncNodeOpen(const SSyncInfo* pSyncInfo) {
       sError("failed to create dir:%s since %s", pSyncInfo->path, terrstr());
       return NULL;
     }
+  }
 
+  snprintf(pSyncNode->configPath, sizeof(pSyncNode->configPath), "%s/raft_config.json", pSyncInfo->path);
+  if (!taosCheckExistFile(pSyncNode->configPath)) {
     // create raft config file
-    snprintf(pSyncNode->configPath, sizeof(pSyncNode->configPath), "%s/raft_config.json", pSyncInfo->path);
     ret = syncCfgCreateFile((SSyncCfg*)&(pSyncInfo->syncCfg), pSyncNode->configPath);
     assert(ret == 0);
+
+  } else {
+    // update syncCfg by raft_config.json
+    pSyncNode->pRaftCfg = raftCfgOpen(pSyncNode->configPath);
+    assert(pSyncNode->pRaftCfg != NULL);
+    pSyncInfo->syncCfg = pSyncNode->pRaftCfg->cfg;
+
+    char *seralized = raftCfg2Str(pSyncNode->pRaftCfg);
+    sInfo("syncNodeOpen update config :%s", seralized);
+    taosMemoryFree(seralized);
+
+    raftCfgClose(pSyncNode->pRaftCfg);
   }
 
   // init by SSyncInfo
diff --git a/source/libs/sync/test/syncTest.cpp b/source/libs/sync/test/syncTest.cpp
index 76024e061effc99fe744fac4d7266a1fd94a9207..5d205d8efea4197ce39077153a89909f90db94b9 100644
--- a/source/libs/sync/test/syncTest.cpp
+++ b/source/libs/sync/test/syncTest.cpp
@@ -49,7 +49,7 @@ void test4() {
   logTest((char*)__FUNCTION__);
 }
 
-int main() {
+int main(int argc, char **argv) {
   // taosInitLog("tmp/syncTest.log", 100);
   tsAsyncLog = 0;
 
@@ -58,6 +58,14 @@ int main() {
   test3();
   test4();
 
+  if (argc == 2) {
+    bool bTaosDirExist = taosDirExist(argv[1]);
+    printf("%s bTaosDirExist:%d \n", argv[1], bTaosDirExist);
+
+    bool bTaosCheckExistFile = taosCheckExistFile(argv[1]);
+    printf("%s bTaosCheckExistFile:%d \n", argv[1], bTaosCheckExistFile);
+  }
+
   // taosCloseLog();
   return 0;
 }