diff --git a/source/libs/sync/inc/syncRaftCfg.h b/source/libs/sync/inc/syncRaftCfg.h
index f0bfb883530287492f7bc44b22026f416ed4b6ed..ba0f9738154475395dd17411b4eb616b5d919b4a 100644
--- a/source/libs/sync/inc/syncRaftCfg.h
+++ b/source/libs/sync/inc/syncRaftCfg.h
@@ -29,7 +29,7 @@ extern "C" {
 
 #define CONFIG_FILE_LEN 2048
 
-#define MAX_CONFIG_INDEX_COUNT 512
+#define MAX_CONFIG_INDEX_COUNT 256
 
 // SRaftCfgIndex ------------------------------------------
 typedef struct SRaftCfgIndex {
diff --git a/source/libs/sync/src/syncMain.c b/source/libs/sync/src/syncMain.c
index 9f9fdf48443b021578600346488f1adb75efec1a..c7784cd62e29cc22271de137204f69be8023581b 100644
--- a/source/libs/sync/src/syncMain.c
+++ b/source/libs/sync/src/syncMain.c
@@ -1132,9 +1132,11 @@ void syncNodeStart(SSyncNode* pSyncNode) {
     syncNodeBecomeFollower(pSyncNode, "first start");
   }
 
-  int32_t ret = 0;
-  // ret = syncNodeStartPingTimer(pSyncNode);
-  ASSERT(ret == 0);
+  if (pSyncNode->vgId == 1) {
+    int32_t ret = 0;
+    ret = syncNodeStartPingTimer(pSyncNode);
+    ASSERT(ret == 0);
+  }
 }
 
 void syncNodeStartStandBy(SSyncNode* pSyncNode) {
@@ -1146,6 +1148,12 @@ void syncNodeStartStandBy(SSyncNode* pSyncNode) {
   int32_t electMS = TIMER_MAX_MS;
   int32_t ret = syncNodeRestartElectTimer(pSyncNode, electMS);
   ASSERT(ret == 0);
+
+  if (pSyncNode->vgId == 1) {
+    int32_t ret = 0;
+    ret = syncNodeStartPingTimer(pSyncNode);
+    ASSERT(ret == 0);
+  }
 }
 
 void syncNodeClose(SSyncNode* pSyncNode) {
diff --git a/source/libs/sync/src/syncTimeout.c b/source/libs/sync/src/syncTimeout.c
index 65314b812a5b6453577ceb1fd2dd8918f6785974..af15c377fbc36ae523776824962f282462ff2bc9 100644
--- a/source/libs/sync/src/syncTimeout.c
+++ b/source/libs/sync/src/syncTimeout.c
@@ -15,12 +15,55 @@
 
 #include "syncTimeout.h"
 #include "syncElection.h"
+#include "syncRaftCfg.h"
 #include "syncReplication.h"
 #include "syncRespMgr.h"
 
+static void syncNodeCleanConfigIndex(SSyncNode* ths) {
+  int32_t   newArrIndex = 0;
+  SyncIndex newConfigIndexArr[MAX_CONFIG_INDEX_COUNT];
+  memset(newConfigIndexArr, 0, sizeof(newConfigIndexArr));
+
+  SSnapshot snapshot = {0};
+  if (ths->pFsm != NULL && ths->pFsm->FpGetSnapshotInfo != NULL) {
+    ths->pFsm->FpGetSnapshotInfo(ths->pFsm, &snapshot);
+  }
+
+  if (snapshot.lastApplyIndex != SYNC_INDEX_INVALID) {
+    for (int i = 0; i < ths->pRaftCfg->configIndexCount; ++i) {
+      if (ths->pRaftCfg->configIndexArr[i] < snapshot.lastConfigIndex) {
+        // pass
+        ;
+      } else {
+        // save
+        newConfigIndexArr[newArrIndex] = ths->pRaftCfg->configIndexArr[i];
+        ++newArrIndex;
+      }
+    }
+
+    int32_t oldCnt = ths->pRaftCfg->configIndexCount;
+    ths->pRaftCfg->configIndexCount = newArrIndex;
+    memcpy(ths->pRaftCfg->configIndexArr, newConfigIndexArr, sizeof(newConfigIndexArr));
+
+    int32_t code = raftCfgPersist(ths->pRaftCfg);
+    ASSERT(code == 0);
+
+    do {
+      char logBuf[128];
+      snprintf(logBuf, sizeof(logBuf), "clean config index arr, old-cnt:%d, new-cnt:%d", oldCnt,
+               ths->pRaftCfg->configIndexCount);
+      syncNodeEventLog(ths, logBuf);
+    } while (0);
+  }
+}
+
 int32_t syncNodeTimerRoutine(SSyncNode* ths) {
   syncNodeEventLog(ths, "timer routines");
 
+  if (ths->vgId == 1) {
+    syncNodeCleanConfigIndex(ths);
+  }
+
 #if 0
   if (ths->vgId != 1) {
     syncRespClean(ths->pSyncRespMgr);
@@ -41,7 +84,7 @@ int32_t syncNodeOnTimeoutCb(SSyncNode* ths, SyncTimeout* pMsg) {
       // syncNodePingAll(ths);
       // syncNodePingPeers(ths);
 
-      sTrace("vgId:%d, sync timeout, type:ping count:%d", ths->vgId, ths->pingTimerCounter);
+      // sTrace("vgId:%d, sync timeout, type:ping count:%d", ths->vgId, ths->pingTimerCounter);
       syncNodeTimerRoutine(ths);
     }