diff --git a/source/libs/sync/inc/syncEnv.h b/source/libs/sync/inc/syncEnv.h
index 960afe37b08ca83779480eb6c3dcb28881aa52f6..c4735d448131c0e54dc3944c687081fe49c02b57 100644
--- a/source/libs/sync/inc/syncEnv.h
+++ b/source/libs/sync/inc/syncEnv.h
@@ -28,12 +28,16 @@ extern "C" {
 #include "trpc.h"
 #include "ttimer.h"
 
+#define TIMER_MAX_MS 0x7FFFFFFF
+
 typedef struct SSyncEnv {
   tmr_h pEnvTickTimer;
   tmr_h pTimerManager;
   char  name[128];
 } SSyncEnv;
 
+extern SSyncEnv *gSyncEnv;
+
 int32_t syncEnvStart();
 
 int32_t syncEnvStop();
diff --git a/source/libs/sync/inc/syncIO.h b/source/libs/sync/inc/syncIO.h
index 49edeb638bd646e5d5bed2fb64aaf9aef20b2187..ec887aa85523ddf87cfbc55b6a5fe741c9630235 100644
--- a/source/libs/sync/inc/syncIO.h
+++ b/source/libs/sync/inc/syncIO.h
@@ -30,10 +30,10 @@ extern "C" {
 #include "trpc.h"
 
 typedef struct SSyncIO {
-  void *      serverRpc;
-  void *      clientRpc;
+  void       *serverRpc;
+  void       *clientRpc;
   STaosQueue *pMsgQ;
-  STaosQset * pQset;
+  STaosQset  *pQset;
   pthread_t   tid;
   int8_t      isStart;
 
@@ -56,10 +56,9 @@ typedef struct SSyncIO {
 
 extern SSyncIO *gSyncIO;
 
-int32_t  syncIOStart();
-int32_t  syncIOStop();
-int32_t  syncIOSendMsg(void *handle, const SEpSet *pEpSet, SRpcMsg *pMsg);
-SSyncIO *syncIOCreate();
+int32_t syncIOStart();
+int32_t syncIOStop();
+int32_t syncIOSendMsg(void *handle, const SEpSet *pEpSet, SRpcMsg *pMsg);
 
 #ifdef __cplusplus
 }
diff --git a/source/libs/sync/inc/syncInt.h b/source/libs/sync/inc/syncInt.h
index a8451b3dc460ff8197e4caef3d45ce5570dbff81..e02e2d7374b4a67317e7399d5da4e0cc91c22f0f 100644
--- a/source/libs/sync/inc/syncInt.h
+++ b/source/libs/sync/inc/syncInt.h
@@ -88,6 +88,9 @@ typedef struct SyncAppendEntries SyncAppendEntries;
 struct SyncAppendEntriesReply;
 typedef struct SyncAppendEntriesReply SyncAppendEntriesReply;
 
+struct SSyncEnv;
+typedef struct SSyncEnv SSyncEnv;
+
 typedef struct SRaftId {
   SyncNodeId  addr;
   SyncGroupId vgId;
@@ -103,32 +106,46 @@ typedef struct SSyncNode {
   SSyncCfg    syncCfg;
   char        path[TSDB_FILENAME_LEN];
 
+  SNodeInfo me;
+  SNodeInfo peers[TSDB_MAX_REPLICA];
+  int32_t   peersNum;
+
   ESyncRole role;
   SRaftId   raftId;
   SSyncFSM* pFsm;
 
-  tmr_h pPingTimer;
-  tmr_h pElectionTimer;
-  tmr_h pHeartbeatTimer;
-
-  int32_t (*FpPing)(struct SSyncNode* ths, const SyncPing* pMsg);
-
+  tmr_h             pPingTimer;
+  int32_t           pingTimerMS;
+  uint8_t           pingTimerStart;
+  TAOS_TMR_CALLBACK FpPingTimer;  // Timer Fp
+  uint64_t          pingTimerCounter;
+
+  tmr_h             pElectTimer;
+  int32_t           electTimerMS;
+  uint8_t           electTimerStart;
+  TAOS_TMR_CALLBACK FpElectTimer;  // Timer Fp
+  uint64_t          electTimerCounter;
+
+  tmr_h             pHeartbeatTimer;
+  int32_t           heartbeatTimerMS;
+  uint8_t           heartbeatTimerStart;
+  TAOS_TMR_CALLBACK FpHeartbeatTimer;  // Timer Fp
+  uint64_t          heartbeatTimerCounter;
+
+  // callback
   int32_t (*FpOnPing)(struct SSyncNode* ths, SyncPing* pMsg);
 
   int32_t (*FpOnPingReply)(struct SSyncNode* ths, SyncPingReply* pMsg);
 
-  int32_t (*FpRequestVote)(struct SSyncNode* ths, const SyncRequestVote* pMsg);
-
   int32_t (*FpOnRequestVote)(struct SSyncNode* ths, SyncRequestVote* pMsg);
 
   int32_t (*FpOnRequestVoteReply)(struct SSyncNode* ths, SyncRequestVoteReply* pMsg);
 
-  int32_t (*FpAppendEntries)(struct SSyncNode* ths, const SyncAppendEntries* pMsg);
-
   int32_t (*FpOnAppendEntries)(struct SSyncNode* ths, SyncAppendEntries* pMsg);
 
   int32_t (*FpOnAppendEntriesReply)(struct SSyncNode* ths, SyncAppendEntriesReply* pMsg);
 
+  // passed from outside
   int32_t (*FpSendMsg)(void* handle, const SEpSet* pEpSet, SRpcMsg* pMsg);
 
 } SSyncNode;
@@ -143,6 +160,10 @@ void syncNodePingPeers(SSyncNode* pSyncNode);
 
 void syncNodePingSelf(SSyncNode* pSyncNode);
 
+int32_t syncNodeStartPingTimer(SSyncNode* pSyncNode);
+
+int32_t syncNodeStopPingTimer(SSyncNode* pSyncNode);
+
 #ifdef __cplusplus
 }
 #endif
diff --git a/source/libs/sync/src/syncEnv.c b/source/libs/sync/src/syncEnv.c
index 0447fc246aebe467dabeab26a6a49c5a63876afc..bfdf2a9c5eebdd588faa2e5ff9a7875b9c9ad993 100644
--- a/source/libs/sync/src/syncEnv.c
+++ b/source/libs/sync/src/syncEnv.c
@@ -59,7 +59,7 @@ static int32_t doSyncEnvStart(SSyncEnv *pSyncEnv) {
   // start tmr thread
   pSyncEnv->pTimerManager = taosTmrInit(1000, 50, 10000, "SYNC-ENV");
 
-  pSyncEnv->pEnvTickTimer = taosTmrStart(syncEnvTick, 1000, pSyncEnv, pSyncEnv->pTimerManager);
+  // pSyncEnv->pEnvTickTimer = taosTmrStart(syncEnvTick, 1000, pSyncEnv, pSyncEnv->pTimerManager);
 
   sTrace("SyncEnv start ok, name:%s", pSyncEnv->name);
 
diff --git a/source/libs/sync/src/syncIO.c b/source/libs/sync/src/syncIO.c
index 34eaf5fe1e653fcb0555d47da6942d20f76fcf69..5c27f9ec3ac957a6e3460453a1ef72391d6feb9e 100644
--- a/source/libs/sync/src/syncIO.c
+++ b/source/libs/sync/src/syncIO.c
@@ -23,17 +23,18 @@
 SSyncIO *gSyncIO = NULL;
 
 // local function ------------
-static void *syncConsumer(void *param);
-static int   retrieveAuthInfo(void *parent, char *meterId, char *spi, char *encrypt, char *secret, char *ckey);
-static void  processResponse(void *pParent, SRpcMsg *pMsg, SEpSet *pEpSet);
-static void  processRequestMsg(void *pParent, SRpcMsg *pMsg, SEpSet *pEpSet);
-static void  syncTick(void *param, void *tmrId);
-
 static int32_t doSyncIOStart(SSyncIO *io);
 static int32_t doSyncIOStop(SSyncIO *io);
 static int32_t doSyncIOPing(SSyncIO *io);
 static int32_t doSyncIOOnMsg(struct SSyncIO *io, void *pParent, SRpcMsg *pMsg, SEpSet *pEpSet);
 static int32_t doSyncIODestroy(SSyncIO *io);
+
+static SSyncIO *syncIOCreate();
+static void *   syncIOConsumer(void *param);
+static int      syncIOAuth(void *parent, char *meterId, char *spi, char *encrypt, char *secret, char *ckey);
+static void     syncIODoReply(void *pParent, SRpcMsg *pMsg, SEpSet *pEpSet);
+static void     syncIODoRequest(void *pParent, SRpcMsg *pMsg, SEpSet *pEpSet);
+static void     syncIOTick(void *param, void *tmrId);
 // ----------------------------
 
 int32_t syncIOSendMsg(void *handle, const SEpSet *pEpSet, SRpcMsg *pMsg) { return 0; }
@@ -47,27 +48,10 @@ int32_t syncIOStart() {
 
 int32_t syncIOStop() { return 0; }
 
-SSyncIO *syncIOCreate() {
-  SSyncIO *io = (SSyncIO *)malloc(sizeof(SSyncIO));
-  memset(io, 0, sizeof(*io));
-
-  io->pMsgQ = taosOpenQueue();
-  io->pQset = taosOpenQset();
-  taosAddIntoQset(io->pQset, io->pMsgQ, NULL);
-
-  io->start = doSyncIOStart;
-  io->stop = doSyncIOStop;
-  io->ping = doSyncIOPing;
-  io->onMsg = doSyncIOOnMsg;
-  io->destroy = doSyncIODestroy;
-
-  return io;
-}
-
 // local function ------------
-static void syncTick(void *param, void *tmrId) {
+static void syncIOTick(void *param, void *tmrId) {
   SSyncIO *io = (SSyncIO *)param;
-  sDebug("syncTick ... ");
+  sDebug("syncIOTick ... ");
 
   SRpcMsg rpcMsg;
   rpcMsg.pCont = rpcMallocCont(10);
@@ -83,15 +67,15 @@ static void syncTick(void *param, void *tmrId) {
 
   taosWriteQitem(io->pMsgQ, pTemp);
 
-  bool b = taosTmrReset(syncTick, 1000, io, io->syncTimerManager, io->syncTimer);
+  bool b = taosTmrReset(syncIOTick, 1000, io, io->syncTimerManager, io->syncTimer);
   assert(b);
 }
 
-static void *syncConsumer(void *param) {
+static void *syncIOConsumer(void *param) {
   SSyncIO *io = param;
 
   STaosQall *qall;
-  SRpcMsg   *pRpcMsg, rpcMsg;
+  SRpcMsg *  pRpcMsg, rpcMsg;
   int        type;
 
   qall = taosAllocateQall();
@@ -129,19 +113,19 @@ static void *syncConsumer(void *param) {
   return NULL;
 }
 
-static int retrieveAuthInfo(void *parent, char *meterId, char *spi, char *encrypt, char *secret, char *ckey) {
+static int syncIOAuth(void *parent, char *meterId, char *spi, char *encrypt, char *secret, char *ckey) {
   // app shall retrieve the auth info based on meterID from DB or a data file
   // demo code here only for simple demo
   int ret = 0;
   return ret;
 }
 
-static void processResponse(void *pParent, SRpcMsg *pMsg, SEpSet *pEpSet) {
-  sDebug("processResponse ... ");
+static void syncIODoReply(void *pParent, SRpcMsg *pMsg, SEpSet *pEpSet) {
+  sDebug("syncIODoReply ... ");
   rpcFreeCont(pMsg->pCont);
 }
 
-static void processRequestMsg(void *pParent, SRpcMsg *pMsg, SEpSet *pEpSet) {
+static void syncIODoRequest(void *pParent, SRpcMsg *pMsg, SEpSet *pEpSet) {
   SSyncIO *io = pParent;
   SRpcMsg *pTemp;
 
@@ -152,6 +136,23 @@ static void processRequestMsg(void *pParent, SRpcMsg *pMsg, SEpSet *pEpSet) {
   taosWriteQitem(io->pMsgQ, pTemp);
 }
 
+static SSyncIO *syncIOCreate() {
+  SSyncIO *io = (SSyncIO *)malloc(sizeof(SSyncIO));
+  memset(io, 0, sizeof(*io));
+
+  io->pMsgQ = taosOpenQueue();
+  io->pQset = taosOpenQset();
+  taosAddIntoQset(io->pQset, io->pMsgQ, NULL);
+
+  io->start = doSyncIOStart;
+  io->stop = doSyncIOStop;
+  io->ping = doSyncIOPing;
+  io->onMsg = doSyncIOOnMsg;
+  io->destroy = doSyncIODestroy;
+
+  return io;
+}
+
 static int32_t doSyncIOStart(SSyncIO *io) {
   taosBlockSIGPIPE();
 
@@ -164,7 +165,7 @@ static int32_t doSyncIOStart(SSyncIO *io) {
     rpcInit.localPort = 0;
     rpcInit.label = "SYNC-IO-CLIENT";
     rpcInit.numOfThreads = 1;
-    rpcInit.cfp = processResponse;
+    rpcInit.cfp = syncIODoReply;
     rpcInit.sessions = 100;
     rpcInit.idleTime = 100;
     rpcInit.user = "sync-io";
@@ -187,10 +188,10 @@ static int32_t doSyncIOStart(SSyncIO *io) {
     rpcInit.localPort = 38000;
     rpcInit.label = "SYNC-IO-SERVER";
     rpcInit.numOfThreads = 1;
-    rpcInit.cfp = processRequestMsg;
+    rpcInit.cfp = syncIODoRequest;
     rpcInit.sessions = 1000;
     rpcInit.idleTime = 2 * 1500;
-    rpcInit.afp = retrieveAuthInfo;
+    rpcInit.afp = syncIOAuth;
     rpcInit.parent = io;
     rpcInit.connType = TAOS_CONN_SERVER;
 
@@ -206,7 +207,7 @@ static int32_t doSyncIOStart(SSyncIO *io) {
 
   // start consumer thread
   {
-    if (pthread_create(&io->tid, NULL, syncConsumer, io) != 0) {
+    if (pthread_create(&io->tid, NULL, syncIOConsumer, io) != 0) {
       sError("failed to create sync consumer thread since %s", strerror(errno));
       terrno = TAOS_SYSTEM_ERROR(errno);
       return -1;
@@ -215,7 +216,7 @@ static int32_t doSyncIOStart(SSyncIO *io) {
 
   // start tmr thread
   io->syncTimerManager = taosTmrInit(1000, 50, 10000, "SYNC");
-  io->syncTimer = taosTmrStart(syncTick, 1000, io, io->syncTimerManager);
+  io->syncTimer = taosTmrStart(syncIOTick, 1000, io, io->syncTimerManager);
 
   return 0;
 }
diff --git a/source/libs/sync/src/syncMain.c b/source/libs/sync/src/syncMain.c
index 75b40dc625538ba9420f5445974bd108e3803a22..7cfc470f60c7572d2dc607d226a407ac43dbb931 100644
--- a/source/libs/sync/src/syncMain.c
+++ b/source/libs/sync/src/syncMain.c
@@ -15,6 +15,7 @@
 
 #include <stdint.h>
 #include "sync.h"
+#include "syncEnv.h"
 #include "syncInt.h"
 #include "syncRaft.h"
 
@@ -30,6 +31,7 @@ static int32_t onSyncNodeRequestVoteReply(struct SSyncNode* ths, SyncRequestVote
 static int32_t doSyncNodeAppendEntries(struct SSyncNode* ths, const SyncAppendEntries* pMsg);
 static int32_t onSyncNodeAppendEntries(struct SSyncNode* ths, SyncAppendEntries* pMsg);
 static int32_t onSyncNodeAppendEntriesReply(struct SSyncNode* ths, SyncAppendEntriesReply* pMsg);
+static void    syncNodePingTimerCb(void* param, void* tmrId);
 // ---------------------------------
 
 int32_t syncInit() {
@@ -58,16 +60,19 @@ void syncGetNodesRole(int64_t rid, SNodesRole* pNodeRole) {}
 SSyncNode* syncNodeOpen(const SSyncInfo* pSyncInfo) {
   SSyncNode* pSyncNode = (SSyncNode*)malloc(sizeof(SSyncNode));
   assert(pSyncNode != NULL);
+  memset(pSyncNode, 0, sizeof(SSyncNode));
 
-  pSyncNode->FpSendMsg = pSyncInfo->FpSendMsg;
+  pSyncNode->pPingTimer = NULL;
+  pSyncNode->pingTimerMS = 1000;
+  atomic_store_8(&pSyncNode->pingTimerStart, 0);
+  pSyncNode->FpPingTimer = syncNodePingTimerCb;
+  pSyncNode->pingTimerCounter = 0;
 
-  pSyncNode->FpPing = doSyncNodePing;
+  pSyncNode->FpSendMsg = pSyncInfo->FpSendMsg;
   pSyncNode->FpOnPing = onSyncNodePing;
   pSyncNode->FpOnPingReply = onSyncNodePingReply;
-  pSyncNode->FpRequestVote = doSyncNodeRequestVote;
   pSyncNode->FpOnRequestVote = onSyncNodeRequestVote;
   pSyncNode->FpOnRequestVoteReply = onSyncNodeRequestVoteReply;
-  pSyncNode->FpAppendEntries = doSyncNodeAppendEntries;
   pSyncNode->FpOnAppendEntries = onSyncNodeAppendEntries;
   pSyncNode->FpOnAppendEntriesReply = onSyncNodeAppendEntriesReply;
 
@@ -85,6 +90,25 @@ void syncNodePingPeers(SSyncNode* pSyncNode) {}
 
 void syncNodePingSelf(SSyncNode* pSyncNode) {}
 
+int32_t syncNodeStartPingTimer(SSyncNode* pSyncNode) {
+  if (pSyncNode->pPingTimer == NULL) {
+    pSyncNode->pPingTimer =
+        taosTmrStart(pSyncNode->FpPingTimer, pSyncNode->pingTimerCounter, pSyncNode, gSyncEnv->pTimerManager);
+  } else {
+    taosTmrReset(pSyncNode->FpPingTimer, pSyncNode->pingTimerCounter, pSyncNode, gSyncEnv->pTimerManager,
+                 &pSyncNode->pPingTimer);
+  }
+
+  atomic_store_8(&pSyncNode->pingTimerStart, 1);
+  return 0;
+}
+
+int32_t syncNodeStopPingTimer(SSyncNode* pSyncNode) {
+  atomic_store_8(&pSyncNode->pingTimerStart, 0);
+  pSyncNode->pingTimerCounter = TIMER_MAX_MS;
+  return 0;
+}
+
 // ------ local funciton ---------
 static int32_t doSyncNodePing(struct SSyncNode* ths, const SyncPing* pMsg) {
   int32_t ret = 0;
@@ -129,4 +153,20 @@ static int32_t onSyncNodeAppendEntries(struct SSyncNode* ths, SyncAppendEntries*
 static int32_t onSyncNodeAppendEntriesReply(struct SSyncNode* ths, SyncAppendEntriesReply* pMsg) {
   int32_t ret = 0;
   return ret;
+}
+
+static void syncNodePingTimerCb(void* param, void* tmrId) {
+  SSyncNode* pSyncNode = (SSyncNode*)param;
+  if (atomic_load_8(&pSyncNode->pingTimerStart)) {
+    ++(pSyncNode->pingTimerCounter);
+    // pSyncNode->pingTimerMS += 100;
+
+    sTrace("pSyncNode->pingTimerCounter:%lu, pSyncNode->pingTimerMS:%d, pSyncNode->pPingTimer:%p, tmrId:%p ",
+           pSyncNode->pingTimerCounter, pSyncNode->pingTimerMS, pSyncNode->pPingTimer, tmrId);
+
+    taosTmrReset(syncNodePingTimerCb, pSyncNode->pingTimerMS, pSyncNode, &gSyncEnv->pTimerManager,
+                 &pSyncNode->pPingTimer);
+
+    syncNodePingSelf(pSyncNode);
+  }
 }
\ No newline at end of file
diff --git a/source/libs/sync/test/syncPingTest.cpp b/source/libs/sync/test/syncPingTest.cpp
index 110c8c472ffa3c0ac7afd7713a651d3496ed1b06..bf0d342ca4bb391dc9801aabcace60c07e7ba518 100644
--- a/source/libs/sync/test/syncPingTest.cpp
+++ b/source/libs/sync/test/syncPingTest.cpp
@@ -44,8 +44,8 @@ SSyncNode* doSync() {
   return pSyncNode;
 }
 
-void timerPingAll(void *param, void *tmrId) {
-  SSyncNode *pSyncNode = (SSyncNode*)param;
+void timerPingAll(void* param, void* tmrId) {
+  SSyncNode* pSyncNode = (SSyncNode*)param;
   syncNodePingAll(pSyncNode);
 }
 
@@ -64,7 +64,13 @@ int main() {
 
   SSyncNode* pSyncNode = doSync();
 
-  pSyncNode->pPingTimer = syncEnvStartTimer(timerPingAll, 1000, pSyncNode);
+  ret = syncNodeStartPingTimer(pSyncNode);
+  assert(ret == 0);
+
+  taosMsleep(5000);
+
+  ret = syncNodeStopPingTimer(pSyncNode);
+  assert(ret == 0);
 
   while (1) {
     taosMsleep(1000);