diff --git a/source/libs/sync/inc/syncIO.h b/source/libs/sync/inc/syncIO.h
index a948de8ac1..160fefd086 100644
--- a/source/libs/sync/inc/syncIO.h
+++ b/source/libs/sync/inc/syncIO.h
@@ -31,11 +31,11 @@ extern "C" {
 
 typedef struct SSyncIO {
   STaosQueue *pMsgQ;
-  STaosQset  *pQset;
+  STaosQset * pQset;
   pthread_t   consumerTid;
 
-  void  *serverRpc;
-  void  *clientRpc;
+  void * serverRpc;
+  void * clientRpc;
   SEpSet myAddr;
 
   void *ioTimerTickQ;
diff --git a/source/libs/sync/inc/syncMessage.h b/source/libs/sync/inc/syncMessage.h
index a2e745b3d9..b022044528 100644
--- a/source/libs/sync/inc/syncMessage.h
+++ b/source/libs/sync/inc/syncMessage.h
@@ -30,7 +30,8 @@ extern "C" {
 
 // encode as uint32
 typedef enum ESyncMessageType {
-  SYNC_UNKNOWN = 99,
+  SYNC_UNKNOWN = 77,
+  SYNC_TIMEOUT = 99,
   SYNC_PING = 101,
   SYNC_PING_REPLY = 103,
   SYNC_CLIENT_REQUEST = 105,
@@ -39,7 +40,7 @@ typedef enum ESyncMessageType {
   SYNC_REQUEST_VOTE_REPLY = 111,
   SYNC_APPEND_ENTRIES = 113,
   SYNC_APPEND_ENTRIES_REPLY = 115,
-  SYNC_TIMEOUT = 117,
+
 } ESyncMessageType;
 
 // ---------------------------------------------
@@ -48,17 +49,28 @@ cJSON* syncRpcUnknownMsg2Json();
 
 // ---------------------------------------------
 typedef enum ESyncTimeoutType {
-  SYNC_TIMEOUT_PING = 0,
+  SYNC_TIMEOUT_PING = 100,
   SYNC_TIMEOUT_ELECTION,
   SYNC_TIMEOUT_HEARTBEAT,
 
 } ESyncTimeoutType;
 
 typedef struct SyncTimeout {
-  ESyncTimeoutType type;
+  uint32_t         bytes;
+  uint32_t         msgType;
+  ESyncTimeoutType timeoutType;
   void*            data;
 } SyncTimeout;
 
+SyncTimeout* syncTimeoutBuild();
+void         syncTimeoutDestroy(SyncTimeout* pMsg);
+void         syncTimeoutSerialize(const SyncTimeout* pMsg, char* buf, uint32_t bufLen);
+void         syncTimeoutDeserialize(const char* buf, uint32_t len, SyncTimeout* pMsg);
+void         syncTimeout2RpcMsg(const SyncTimeout* pMsg, SRpcMsg* pRpcMsg);
+void         syncTimeoutFromRpcMsg(const SRpcMsg* pRpcMsg, SyncTimeout* pMsg);
+cJSON*       syncTimeout2Json(const SyncTimeout* pMsg);
+SyncTimeout* syncTimeoutBuild2(ESyncTimeoutType timeoutType, void* data);
+
 // ---------------------------------------------
 typedef struct SyncPing {
   uint32_t bytes;
diff --git a/source/libs/sync/src/syncIO.c b/source/libs/sync/src/syncIO.c
index ffd982f233..55c4d57201 100644
--- a/source/libs/sync/src/syncIO.c
+++ b/source/libs/sync/src/syncIO.c
@@ -246,7 +246,14 @@ static void *syncIOConsumerFunc(void *param) {
         }
 
       } else if (pRpcMsg->msgType == SYNC_TIMEOUT) {
-            } else {
+        if (io->FpOnSyncTimeout != NULL) {
+          SyncTimeout *pSyncMsg;
+          pSyncMsg = syncTimeoutBuild();
+          syncTimeoutFromRpcMsg(pRpcMsg, pSyncMsg);
+          io->FpOnSyncTimeout(io->pSyncNode, pSyncMsg);
+          syncTimeoutDestroy(pSyncMsg);
+        }
+      } else {
         ;
       }
     }
diff --git a/source/libs/sync/src/syncMain.c b/source/libs/sync/src/syncMain.c
index 57bc754735..5f3a276a68 100644
--- a/source/libs/sync/src/syncMain.c
+++ b/source/libs/sync/src/syncMain.c
@@ -27,6 +27,10 @@ static int32_t syncNodeSendMsgById(const SRaftId* destRaftId, SSyncNode* pSyncNo
 static int32_t syncNodeSendMsgByInfo(const SNodeInfo* nodeInfo, SSyncNode* pSyncNode, SRpcMsg* pMsg);
 static void    syncNodePingTimerCb(void* param, void* tmrId);
 
+static void syncNodeEqPingTimer(void* param, void* tmrId);
+static void syncNodeEqElectTimer(void* param, void* tmrId);
+static void syncNodeEqHeartbeatTimer(void* param, void* tmrId);
+
 static int32_t syncNodePing(SSyncNode* pSyncNode, const SRaftId* destRaftId, SyncPing* pMsg);
 static int32_t syncNodeRequestVote(SSyncNode* ths, const SyncRequestVote* pMsg);
 static int32_t syncNodeAppendEntries(SSyncNode* ths, const SyncAppendEntries* pMsg);
@@ -95,7 +99,7 @@ SSyncNode* syncNodeOpen(const SSyncInfo* pSyncInfo) {
   pSyncNode->pPingTimer = NULL;
   pSyncNode->pingTimerMS = 1000;
   atomic_store_8(&pSyncNode->pingTimerEnable, 0);
-  pSyncNode->FpPingTimer = syncNodePingTimerCb;
+  pSyncNode->FpPingTimer = syncNodeEqPingTimer;
   pSyncNode->pingTimerCounter = 0;
 
   pSyncNode->FpOnPing = syncNodeOnPingCb;
@@ -104,6 +108,7 @@ SSyncNode* syncNodeOpen(const SSyncInfo* pSyncInfo) {
   pSyncNode->FpOnRequestVoteReply = syncNodeOnRequestVoteReplyCb;
   pSyncNode->FpOnAppendEntries = syncNodeOnAppendEntriesCb;
   pSyncNode->FpOnAppendEntriesReply = syncNodeOnAppendEntriesReplyCb;
+  pSyncNode->FpOnTimeout = syncNodeOnTimeoutCb;
 
   return pSyncNode;
 }
@@ -329,6 +334,27 @@ static int32_t syncNodeOnAppendEntriesReplyCb(SSyncNode* ths, SyncAppendEntriesR
 
 static int32_t syncNodeOnTimeoutCb(SSyncNode* ths, SyncTimeout* pMsg) {
   int32_t ret = 0;
+  sTrace("<-- syncNodeOnTimeoutCb -->");
+
+  {
+    cJSON* pJson = syncTimeout2Json(pMsg);
+    char*  serialized = cJSON_Print(pJson);
+    sTrace("process syncMessage recv: syncNodeOnTimeoutCb pMsg:%s ", serialized);
+    free(serialized);
+    cJSON_Delete(pJson);
+  }
+
+  if (pMsg->timeoutType == SYNC_TIMEOUT_PING) {
+    if (atomic_load_8(&ths->pingTimerEnable)) {
+      ++(ths->pingTimerCounter);
+      syncNodePingAll(ths);
+    }
+
+  } else if (pMsg->timeoutType == SYNC_TIMEOUT_ELECTION) {
+  } else if (pMsg->timeoutType == SYNC_TIMEOUT_HEARTBEAT) {
+  } else {
+  }
+
   return ret;
 }
 
@@ -336,7 +362,6 @@ static void syncNodePingTimerCb(void* param, void* tmrId) {
   SSyncNode* pSyncNode = (SSyncNode*)param;
   if (atomic_load_8(&pSyncNode->pingTimerEnable)) {
     ++(pSyncNode->pingTimerCounter);
-    // pSyncNode->pingTimerMS += 100;
 
     sTrace(
         "syncNodePingTimerCb: pSyncNode->pingTimerCounter:%lu, pSyncNode->pingTimerMS:%d, pSyncNode->pPingTimer:%p, "
@@ -350,4 +375,26 @@ static void syncNodePingTimerCb(void* param, void* tmrId) {
   } else {
     sTrace("syncNodePingTimerCb: pingTimerEnable:%u ", pSyncNode->pingTimerEnable);
   }
-}
\ No newline at end of file
+}
+
+static void syncNodeEqPingTimer(void* param, void* tmrId) {
+  SSyncNode* pSyncNode = (SSyncNode*)param;
+  if (atomic_load_8(&pSyncNode->pingTimerEnable)) {
+    // pSyncNode->pingTimerMS += 100;
+
+    SyncTimeout* pSyncMsg = syncTimeoutBuild2(SYNC_TIMEOUT_PING, pSyncNode);
+    SRpcMsg      rpcMsg;
+    syncTimeout2RpcMsg(pSyncMsg, &rpcMsg);
+    pSyncNode->FpEqMsg(pSyncNode->queue, &rpcMsg);
+    syncTimeoutDestroy(pSyncMsg);
+
+    taosTmrReset(syncNodeEqPingTimer, pSyncNode->pingTimerMS, pSyncNode, &gSyncEnv->pTimerManager,
+                 &pSyncNode->pPingTimer);
+  } else {
+    sTrace("syncNodeEqPingTimer: pingTimerEnable:%u ", pSyncNode->pingTimerEnable);
+  }
+}
+
+static void syncNodeEqElectTimer(void* param, void* tmrId) {}
+
+static void syncNodeEqHeartbeatTimer(void* param, void* tmrId) {}
\ No newline at end of file
diff --git a/source/libs/sync/src/syncMessage.c b/source/libs/sync/src/syncMessage.c
index 4dbae9bcba..f1434947a1 100644
--- a/source/libs/sync/src/syncMessage.c
+++ b/source/libs/sync/src/syncMessage.c
@@ -24,7 +24,12 @@ void onMessage(SRaft* pRaft, void* pMsg) {}
 cJSON* syncRpcMsg2Json(SRpcMsg* pRpcMsg) {
   cJSON* pRoot;
 
-  if (pRpcMsg->msgType == SYNC_PING) {
+  // in compiler optimization, switch case = if else constants
+  if (pRpcMsg->msgType == SYNC_TIMEOUT) {
+    SyncTimeout* pSyncMsg = (SyncTimeout*)pRpcMsg->pCont;
+    pRoot = syncTimeout2Json(pSyncMsg);
+
+  } else if (pRpcMsg->msgType == SYNC_PING) {
     SyncPing* pSyncMsg = (SyncPing*)pRpcMsg->pCont;
     pRoot = syncPing2Json(pSyncMsg);
 
@@ -73,6 +78,66 @@ cJSON* syncRpcUnknownMsg2Json() {
   return pJson;
 }
 
+// ---- message process SyncTimeout----
+SyncTimeout* syncTimeoutBuild() {
+  uint32_t     bytes = sizeof(SyncTimeout);
+  SyncTimeout* pMsg = malloc(bytes);
+  memset(pMsg, 0, bytes);
+  pMsg->bytes = bytes;
+  pMsg->msgType = SYNC_TIMEOUT;
+  return pMsg;
+}
+
+void syncTimeoutDestroy(SyncTimeout* pMsg) {
+  if (pMsg != NULL) {
+    free(pMsg);
+  }
+}
+
+void syncTimeoutSerialize(const SyncTimeout* pMsg, char* buf, uint32_t bufLen) {
+  assert(pMsg->bytes <= bufLen);
+  memcpy(buf, pMsg, pMsg->bytes);
+}
+
+void syncTimeoutDeserialize(const char* buf, uint32_t len, SyncTimeout* pMsg) {
+  memcpy(pMsg, buf, len);
+  assert(len == pMsg->bytes);
+}
+
+void syncTimeout2RpcMsg(const SyncTimeout* pMsg, SRpcMsg* pRpcMsg) {
+  memset(pRpcMsg, 0, sizeof(*pRpcMsg));
+  pRpcMsg->msgType = pMsg->msgType;
+  pRpcMsg->contLen = pMsg->bytes;
+  pRpcMsg->pCont = rpcMallocCont(pRpcMsg->contLen);
+  syncTimeoutSerialize(pMsg, pRpcMsg->pCont, pRpcMsg->contLen);
+}
+
+void syncTimeoutFromRpcMsg(const SRpcMsg* pRpcMsg, SyncTimeout* pMsg) {
+  syncTimeoutDeserialize(pRpcMsg->pCont, pRpcMsg->contLen, pMsg);
+}
+
+cJSON* syncTimeout2Json(const SyncTimeout* pMsg) {
+  char u64buf[128];
+
+  cJSON* pRoot = cJSON_CreateObject();
+  cJSON_AddNumberToObject(pRoot, "bytes", pMsg->bytes);
+  cJSON_AddNumberToObject(pRoot, "msgType", pMsg->msgType);
+  cJSON_AddNumberToObject(pRoot, "timeoutType", pMsg->timeoutType);
+  snprintf(u64buf, sizeof(u64buf), "%p", pMsg->data);
+  cJSON_AddStringToObject(pRoot, "data", u64buf);
+
+  cJSON* pJson = cJSON_CreateObject();
+  cJSON_AddItemToObject(pJson, "SyncTimeout", pRoot);
+  return pJson;
+}
+
+SyncTimeout* syncTimeoutBuild2(ESyncTimeoutType timeoutType, void* data) {
+  SyncTimeout* pMsg = syncTimeoutBuild();
+  pMsg->timeoutType = timeoutType;
+  pMsg->data = data;
+  return pMsg;
+}
+
 // ---- message process SyncPing----
 SyncPing* syncPingBuild(uint32_t dataLen) {
   uint32_t  bytes = SYNC_PING_FIX_LEN + dataLen;
diff --git a/source/libs/sync/test/syncPingTest.cpp b/source/libs/sync/test/syncPingTest.cpp
index 06ba5ba6ce..77413a713b 100644
--- a/source/libs/sync/test/syncPingTest.cpp
+++ b/source/libs/sync/test/syncPingTest.cpp
@@ -78,6 +78,7 @@ int main(int argc, char** argv) {
   SSyncNode* pSyncNode = doSync(myIndex);
   gSyncIO->FpOnSyncPing = pSyncNode->FpOnPing;
   gSyncIO->FpOnSyncPingReply = pSyncNode->FpOnPingReply;
+  gSyncIO->FpOnSyncTimeout = pSyncNode->FpOnTimeout;
 
   ret = syncNodeStartPingTimer(pSyncNode);
   assert(ret == 0);