diff --git a/include/libs/sync/syncTools.h b/include/libs/sync/syncTools.h
index f8d5768b5d..21ce75c28e 100644
--- a/include/libs/sync/syncTools.h
+++ b/include/libs/sync/syncTools.h
@@ -478,6 +478,8 @@ typedef int32_t (*FpOnRequestVoteReplyCb)(SSyncNode* ths, SyncRequestVoteReply*
 typedef int32_t (*FpOnAppendEntriesCb)(SSyncNode* ths, SyncAppendEntries* pMsg);
 typedef int32_t (*FpOnAppendEntriesReplyCb)(SSyncNode* ths, SyncAppendEntriesReply* pMsg);
 typedef int32_t (*FpOnTimeoutCb)(SSyncNode* pSyncNode, SyncTimeout* pMsg);
+typedef int32_t (*FpOnSnapshotSendCb)(SSyncNode* ths, SyncSnapshotSend* pMsg);
+typedef int32_t (*FpOnSnapshotRspCb)(SSyncNode* ths, SyncSnapshotRsp* pMsg);
 
 // option ----------------------------------
 bool syncNodeSnapshotEnable(SSyncNode* pSyncNode);
diff --git a/source/libs/sync/inc/syncIO.h b/source/libs/sync/inc/syncIO.h
index b69c087b5f..88d3065375 100644
--- a/source/libs/sync/inc/syncIO.h
+++ b/source/libs/sync/inc/syncIO.h
@@ -57,6 +57,9 @@ typedef struct SSyncIO {
   int32_t (*FpOnSyncAppendEntriesReply)(SSyncNode *pSyncNode, SyncAppendEntriesReply *pMsg);
   int32_t (*FpOnSyncTimeout)(SSyncNode *pSyncNode, SyncTimeout *pMsg);
 
+  int32_t (*FpOnSyncSnapshotSend)(SSyncNode *pSyncNode, SyncSnapshotSend *pMsg);
+  int32_t (*FpOnSyncSnapshotRsp)(SSyncNode *pSyncNode, SyncSnapshotRsp *pMsg);
+
   int8_t isStart;
 
 } SSyncIO;
diff --git a/source/libs/sync/inc/syncInt.h b/source/libs/sync/inc/syncInt.h
index fbe31ef031..22aa7b1224 100644
--- a/source/libs/sync/inc/syncInt.h
+++ b/source/libs/sync/inc/syncInt.h
@@ -145,17 +145,8 @@ typedef struct SSyncNode {
   FpOnRequestVoteReplyCb   FpOnRequestVoteReply;
   FpOnAppendEntriesCb      FpOnAppendEntries;
   FpOnAppendEntriesReplyCb FpOnAppendEntriesReply;
-
-  /*
-  int32_t (*FpOnPing)(SSyncNode* ths, SyncPing* pMsg);
-  int32_t (*FpOnPingReply)(SSyncNode* ths, SyncPingReply* pMsg);
-  int32_t (*FpOnClientRequest)(SSyncNode* ths, SyncClientRequest* pMsg);
-  int32_t (*FpOnTimeout)(SSyncNode* pSyncNode, SyncTimeout* pMsg);
-  int32_t (*FpOnRequestVote)(SSyncNode* ths, SyncRequestVote* pMsg);
-  int32_t (*FpOnRequestVoteReply)(SSyncNode* ths, SyncRequestVoteReply* pMsg);
-  int32_t (*FpOnAppendEntries)(SSyncNode* ths, SyncAppendEntries* pMsg);
-  int32_t (*FpOnAppendEntriesReply)(SSyncNode* ths, SyncAppendEntriesReply* pMsg);
-  */
+  FpOnSnapshotSendCb       FpOnSnapshotSend;
+  FpOnSnapshotRspCb        FpOnSnapshotRsp;
 
   // tools
   SSyncRespMgr* pSyncRespMgr;
diff --git a/source/libs/sync/inc/syncSnapshot.h b/source/libs/sync/inc/syncSnapshot.h
index cf69b385ec..ccdf099482 100644
--- a/source/libs/sync/inc/syncSnapshot.h
+++ b/source/libs/sync/inc/syncSnapshot.h
@@ -39,8 +39,8 @@ typedef struct SSyncSnapshotSender {
   bool       start;
   int32_t    seq;
   int32_t    ack;
-  void      *pReader;
-  void      *pCurrentBlock;
+  void *     pReader;
+  void *     pCurrentBlock;
   int32_t    blockLen;
   SSnapshot  snapshot;
   int64_t    sendingMS;
@@ -55,14 +55,14 @@ void                 snapshotSenderStart(SSyncSnapshotSender *pSender);
 void                 snapshotSenderStop(SSyncSnapshotSender *pSender);
 int32_t              snapshotSend(SSyncSnapshotSender *pSender);
 int32_t              snapshotReSend(SSyncSnapshotSender *pSender);
-cJSON               *snapshotSender2Json(SSyncSnapshotSender *pSender);
-char                *snapshotSender2Str(SSyncSnapshotSender *pSender);
+cJSON *              snapshotSender2Json(SSyncSnapshotSender *pSender);
+char *               snapshotSender2Str(SSyncSnapshotSender *pSender);
 
 typedef struct SSyncSnapshotReceiver {
   bool start;
 
   int32_t  ack;
-  void    *pWriter;
+  void *   pWriter;
   SyncTerm term;
 
   SSyncNode *pSyncNode;
@@ -73,8 +73,8 @@ SSyncSnapshotReceiver *snapshotReceiverCreate(SSyncNode *pSyncNode, int32_t repl
 void                   snapshotReceiverDestroy(SSyncSnapshotReceiver *pReceiver);
 void                   snapshotReceiverStart(SSyncSnapshotReceiver *pReceiver);
 void                   snapshotReceiverStop(SSyncSnapshotReceiver *pReceiver);
-cJSON                 *snapshotReceiver2Json(SSyncSnapshotReceiver *pReceiver);
-char                  *snapshotReceiver2Str(SSyncSnapshotReceiver *pReceiver);
+cJSON *                snapshotReceiver2Json(SSyncSnapshotReceiver *pReceiver);
+char *                 snapshotReceiver2Str(SSyncSnapshotReceiver *pReceiver);
 
 int32_t syncNodeOnSnapshotSendCb(SSyncNode *ths, SyncSnapshotSend *pMsg);
 int32_t syncNodeOnSnapshotRspCb(SSyncNode *ths, SyncSnapshotRsp *pMsg);
diff --git a/source/libs/sync/src/syncMain.c b/source/libs/sync/src/syncMain.c
index 91825221e4..a41c1a57c3 100644
--- a/source/libs/sync/src/syncMain.c
+++ b/source/libs/sync/src/syncMain.c
@@ -558,6 +558,9 @@ SSyncNode* syncNodeOpen(const SSyncInfo* pOldSyncInfo) {
   pSyncNode->FpOnClientRequest = syncNodeOnClientRequestCb;
   pSyncNode->FpOnTimeout = syncNodeOnTimeoutCb;
 
+  pSyncNode->FpOnSnapshotSend = syncNodeOnSnapshotSendCb;
+  pSyncNode->FpOnSnapshotRsp = syncNodeOnSnapshotRspCb;
+
   if (pSyncNode->pRaftCfg->snapshotEnable) {
     pSyncNode->FpOnRequestVote = syncNodeOnRequestVoteCb;
     pSyncNode->FpOnRequestVoteReply = syncNodeOnRequestVoteReplyCb;
diff --git a/source/libs/sync/src/syncSnapshot.c b/source/libs/sync/src/syncSnapshot.c
index abeb1722fd..7521416379 100644
--- a/source/libs/sync/src/syncSnapshot.c
+++ b/source/libs/sync/src/syncSnapshot.c
@@ -279,7 +279,7 @@ cJSON *snapshotSender2Json(SSyncSnapshotSender *pSender) {
 
 char *snapshotSender2Str(SSyncSnapshotSender *pSender) {
   cJSON *pJson = snapshotSender2Json(pSender);
-  char  *serialized = cJSON_Print(pJson);
+  char * serialized = cJSON_Print(pJson);
   cJSON_Delete(pJson);
   return serialized;
 }
@@ -393,7 +393,7 @@ cJSON *snapshotReceiver2Json(SSyncSnapshotReceiver *pReceiver) {
 
 char *snapshotReceiver2Str(SSyncSnapshotReceiver *pReceiver) {
   cJSON *pJson = snapshotReceiver2Json(pReceiver);
-  char  *serialized = cJSON_Print(pJson);
+  char * serialized = cJSON_Print(pJson);
   cJSON_Delete(pJson);
   return serialized;
 }
diff --git a/source/libs/sync/test/CMakeLists.txt b/source/libs/sync/test/CMakeLists.txt
index d1e747f29d..530d39a55f 100644
--- a/source/libs/sync/test/CMakeLists.txt
+++ b/source/libs/sync/test/CMakeLists.txt
@@ -38,6 +38,7 @@ add_executable(syncRespMgrTest "")
 add_executable(syncSnapshotTest "")
 add_executable(syncApplyMsgTest "")
 add_executable(syncConfigChangeTest "")
+add_executable(syncConfigChangeSnapshotTest "")
 add_executable(syncSnapshotSendTest "")
 add_executable(syncSnapshotRspTest "")
 add_executable(syncSnapshotSenderTest "")
@@ -204,6 +205,10 @@ target_sources(syncConfigChangeTest
     PRIVATE
     "syncConfigChangeTest.cpp"
 )
+target_sources(syncConfigChangeSnapshotTest
+    PRIVATE
+    "syncConfigChangeSnapshotTest.cpp"
+)
 target_sources(syncSnapshotSendTest
     PRIVATE
     "syncSnapshotSendTest.cpp"
@@ -422,6 +427,11 @@ target_include_directories(syncConfigChangeTest
     "${TD_SOURCE_DIR}/include/libs/sync"
     "${CMAKE_CURRENT_SOURCE_DIR}/../inc"
 )
+target_include_directories(syncConfigChangeSnapshotTest
+    PUBLIC
+    "${TD_SOURCE_DIR}/include/libs/sync"
+    "${CMAKE_CURRENT_SOURCE_DIR}/../inc"
+)
 target_include_directories(syncSnapshotSendTest
     PUBLIC
     "${TD_SOURCE_DIR}/include/libs/sync"
@@ -604,6 +614,10 @@ target_link_libraries(syncConfigChangeTest
     sync
     gtest_main
 )
+target_link_libraries(syncConfigChangeSnapshotTest
+    sync
+    gtest_main
+)
 target_link_libraries(syncSnapshotSendTest
     sync
     gtest_main
diff --git a/source/libs/sync/test/syncConfigChangeSnapshotTest.cpp b/source/libs/sync/test/syncConfigChangeSnapshotTest.cpp
new file mode 100644
index 0000000000..02fc138e4c
--- /dev/null
+++ b/source/libs/sync/test/syncConfigChangeSnapshotTest.cpp
@@ -0,0 +1,283 @@
+#include <gtest/gtest.h>
+#include <stdio.h>
+#include "os.h"
+#include "syncEnv.h"
+#include "syncIO.h"
+#include "syncInt.h"
+#include "syncUtil.h"
+#include "wal.h"
+
+void logTest() {
+  sTrace("--- sync log test: trace");
+  sDebug("--- sync log test: debug");
+  sInfo("--- sync log test: info");
+  sWarn("--- sync log test: warn");
+  sError("--- sync log test: error");
+  sFatal("--- sync log test: fatal");
+}
+
+uint16_t    gPorts[] = {7010, 7110, 7210, 7310, 7410};
+const char* gDir = "./syncReplicateTest";
+int32_t     gVgId = 1234;
+SyncIndex   gSnapshotLastApplyIndex;
+
+void init() {
+  int code = walInit();
+  assert(code == 0);
+
+  code = syncInit();
+  assert(code == 0);
+
+  sprintf(tsTempDir, "%s", ".");
+}
+
+void cleanup() { walCleanUp(); }
+
+void CommitCb(struct SSyncFSM* pFsm, const SRpcMsg* pMsg, SFsmCbMeta cbMeta) {
+  SyncIndex beginIndex = SYNC_INDEX_INVALID;
+  if (pFsm->FpGetSnapshot != NULL) {
+    SSnapshot snapshot;
+    pFsm->FpGetSnapshot(pFsm, &snapshot);
+    beginIndex = snapshot.lastApplyIndex;
+  }
+
+  if (cbMeta.index > beginIndex) {
+    char logBuf[256] = {0};
+    snprintf(logBuf, sizeof(logBuf),
+             "==callback== ==CommitCb== pFsm:%p, index:%ld, isWeak:%d, code:%d, state:%d %s flag:%lu\n", pFsm,
+             cbMeta.index, cbMeta.isWeak, cbMeta.code, cbMeta.state, syncUtilState2String(cbMeta.state), cbMeta.flag);
+    syncRpcMsgLog2(logBuf, (SRpcMsg*)pMsg);
+  } else {
+    sTrace("==callback== ==CommitCb== do not apply again %ld", cbMeta.index);
+  }
+}
+
+void PreCommitCb(struct SSyncFSM* pFsm, const SRpcMsg* pMsg, SFsmCbMeta cbMeta) {
+  char logBuf[256] = {0};
+  snprintf(logBuf, sizeof(logBuf),
+           "==callback== ==PreCommitCb== pFsm:%p, index:%ld, isWeak:%d, code:%d, state:%d %s flag:%lu\n", pFsm,
+           cbMeta.index, cbMeta.isWeak, cbMeta.code, cbMeta.state, syncUtilState2String(cbMeta.state), cbMeta.flag);
+  syncRpcMsgLog2(logBuf, (SRpcMsg*)pMsg);
+}
+
+void RollBackCb(struct SSyncFSM* pFsm, const SRpcMsg* pMsg, SFsmCbMeta cbMeta) {
+  char logBuf[256];
+  snprintf(logBuf, sizeof(logBuf),
+           "==callback== ==RollBackCb== pFsm:%p, index:%ld, isWeak:%d, code:%d, state:%d %s flag:%lu\n", pFsm,
+           cbMeta.index, cbMeta.isWeak, cbMeta.code, cbMeta.state, syncUtilState2String(cbMeta.state), cbMeta.flag);
+  syncRpcMsgLog2(logBuf, (SRpcMsg*)pMsg);
+}
+
+int32_t GetSnapshotCb(struct SSyncFSM* pFsm, SSnapshot* pSnapshot) {
+  pSnapshot->data = NULL;
+  pSnapshot->lastApplyIndex = gSnapshotLastApplyIndex;
+  pSnapshot->lastApplyTerm = 100;
+  return 0;
+}
+
+void RestoreFinishCb(struct SSyncFSM* pFsm) { sTrace("==callback== ==RestoreFinishCb=="); }
+
+void ReConfigCb(struct SSyncFSM* pFsm, SSyncCfg newCfg, SReConfigCbMeta cbMeta) {
+  sTrace("==callback== ==ReConfigCb== flag:0x%lX, isDrop:%d, index:%ld, code:%d, currentTerm:%lu, term:%lu",
+         cbMeta.flag, cbMeta.isDrop, cbMeta.index, cbMeta.code, cbMeta.currentTerm, cbMeta.term);
+}
+
+SSyncFSM* createFsm() {
+  SSyncFSM* pFsm = (SSyncFSM*)taosMemoryMalloc(sizeof(SSyncFSM));
+  memset(pFsm, 0, sizeof(*pFsm));
+
+  pFsm->FpCommitCb = CommitCb;
+  pFsm->FpPreCommitCb = PreCommitCb;
+  pFsm->FpRollBackCb = RollBackCb;
+
+  pFsm->FpGetSnapshot = GetSnapshotCb;
+  pFsm->FpRestoreFinishCb = RestoreFinishCb;
+
+  pFsm->FpReConfigCb = ReConfigCb;
+
+  return pFsm;
+}
+
+SWal* createWal(char* path, int32_t vgId) {
+  SWalCfg walCfg;
+  memset(&walCfg, 0, sizeof(SWalCfg));
+  walCfg.vgId = vgId;
+  walCfg.fsyncPeriod = 1000;
+  walCfg.retentionPeriod = 1000;
+  walCfg.rollPeriod = 1000;
+  walCfg.retentionSize = 1000;
+  walCfg.segSize = 1000;
+  walCfg.level = TAOS_WAL_FSYNC;
+  SWal* pWal = walOpen(path, &walCfg);
+  assert(pWal != NULL);
+  return pWal;
+}
+
+int64_t createSyncNode(int32_t replicaNum, int32_t myIndex, int32_t vgId, SWal* pWal, char* path, bool isStandBy) {
+  SSyncInfo syncInfo;
+  syncInfo.vgId = vgId;
+  syncInfo.msgcb = &gSyncIO->msgcb;
+  syncInfo.FpSendMsg = syncIOSendMsg;
+  syncInfo.FpEqMsg = syncIOEqMsg;
+  syncInfo.pFsm = createFsm();
+  snprintf(syncInfo.path, sizeof(syncInfo.path), "%s_sync_replica%d_index%d", path, replicaNum, myIndex);
+  syncInfo.pWal = pWal;
+  syncInfo.isStandBy = isStandBy;
+  syncInfo.snapshotEnable = true;
+
+  SSyncCfg* pCfg = &syncInfo.syncCfg;
+
+  if (isStandBy) {
+    pCfg->myIndex = 0;
+    pCfg->replicaNum = 1;
+    pCfg->nodeInfo[0].nodePort = gPorts[myIndex];
+    taosGetFqdn(pCfg->nodeInfo[0].nodeFqdn);
+
+  } else {
+    pCfg->myIndex = myIndex;
+    pCfg->replicaNum = replicaNum;
+
+    for (int i = 0; i < replicaNum; ++i) {
+      pCfg->nodeInfo[i].nodePort = gPorts[i];
+      taosGetFqdn(pCfg->nodeInfo[i].nodeFqdn);
+      // snprintf(pCfg->nodeInfo[i].nodeFqdn, sizeof(pCfg->nodeInfo[i].nodeFqdn), "%s", "127.0.0.1");
+    }
+  }
+
+  int64_t rid = syncOpen(&syncInfo);
+  assert(rid > 0);
+
+  SSyncNode* pSyncNode = (SSyncNode*)syncNodeAcquire(rid);
+  assert(pSyncNode != NULL);
+  gSyncIO->FpOnSyncPing = pSyncNode->FpOnPing;
+  gSyncIO->FpOnSyncPingReply = pSyncNode->FpOnPingReply;
+  gSyncIO->FpOnSyncTimeout = pSyncNode->FpOnTimeout;
+  gSyncIO->FpOnSyncClientRequest = pSyncNode->FpOnClientRequest;
+
+  gSyncIO->FpOnSyncRequestVote = pSyncNode->FpOnRequestVote;
+  gSyncIO->FpOnSyncRequestVoteReply = pSyncNode->FpOnRequestVoteReply;
+  gSyncIO->FpOnSyncAppendEntries = pSyncNode->FpOnAppendEntries;
+  gSyncIO->FpOnSyncAppendEntriesReply = pSyncNode->FpOnAppendEntriesReply;
+
+  gSyncIO->FpOnSyncSnapshotSend = pSyncNode->FpOnSnapshotSend;
+  gSyncIO->FpOnSyncSnapshotRsp = pSyncNode->FpOnSnapshotRsp;
+
+  gSyncIO->pSyncNode = pSyncNode;
+  syncNodeRelease(pSyncNode);
+
+  return rid;
+}
+
+void configChange(int64_t rid, int32_t replicaNum, int32_t myIndex) {
+  SSyncCfg syncCfg;
+
+  syncCfg.myIndex = myIndex;
+  syncCfg.replicaNum = replicaNum;
+
+  for (int i = 0; i < replicaNum; ++i) {
+    syncCfg.nodeInfo[i].nodePort = gPorts[i];
+    taosGetFqdn(syncCfg.nodeInfo[i].nodeFqdn);
+  }
+
+  syncReconfig(rid, &syncCfg);
+}
+
+void usage(char* exe) {
+  printf("usage: %s replicaNum myIndex lastApplyIndex writeRecordNum isStandBy isConfigChange \n", exe);
+}
+
+SRpcMsg* createRpcMsg(int i, int count, int myIndex) {
+  SRpcMsg* pMsg = (SRpcMsg*)taosMemoryMalloc(sizeof(SRpcMsg));
+  memset(pMsg, 0, sizeof(SRpcMsg));
+  pMsg->msgType = 9999;
+  pMsg->contLen = 256;
+  pMsg->pCont = rpcMallocCont(pMsg->contLen);
+  snprintf((char*)(pMsg->pCont), pMsg->contLen, "value-myIndex:%u-%d-%d-%ld", myIndex, i, count, taosGetTimestampMs());
+  return pMsg;
+}
+
+int main(int argc, char** argv) {
+  tsAsyncLog = 0;
+  sDebugFlag = DEBUG_TRACE + DEBUG_SCREEN + DEBUG_FILE + DEBUG_INFO;
+  if (argc != 7) {
+    usage(argv[0]);
+    exit(-1);
+  }
+
+  int32_t replicaNum = atoi(argv[1]);
+  int32_t myIndex = atoi(argv[2]);
+  int32_t lastApplyIndex = atoi(argv[3]);
+  int32_t writeRecordNum = atoi(argv[4]);
+  bool    isStandBy = atoi(argv[5]);
+  bool    isConfigChange = atoi(argv[6]);
+  gSnapshotLastApplyIndex = lastApplyIndex;
+
+  if (!isStandBy) {
+    assert(replicaNum >= 1 && replicaNum <= 5);
+    assert(myIndex >= 0 && myIndex < replicaNum);
+    assert(lastApplyIndex >= -1);
+    assert(writeRecordNum >= 0);
+  }
+
+  init();
+  int32_t ret = syncIOStart((char*)"127.0.0.1", gPorts[myIndex]);
+  assert(ret == 0);
+
+  char walPath[128];
+  snprintf(walPath, sizeof(walPath), "%s_wal_replica%d_index%d", gDir, replicaNum, myIndex);
+  SWal* pWal = createWal(walPath, gVgId);
+
+  int64_t rid = createSyncNode(replicaNum, myIndex, gVgId, pWal, (char*)gDir, isStandBy);
+  assert(rid > 0);
+
+  syncStart(rid);
+
+  /*
+    if (isStandBy) {
+      syncStartStandBy(rid);
+    } else {
+      syncStart(rid);
+    }
+  */
+
+  SSyncNode* pSyncNode = (SSyncNode*)syncNodeAcquire(rid);
+  assert(pSyncNode != NULL);
+
+  if (isConfigChange) {
+    configChange(rid, 2, myIndex);
+  }
+
+  //---------------------------
+  int32_t alreadySend = 0;
+  while (1) {
+    char* s = syncNode2SimpleStr(pSyncNode);
+
+    if (alreadySend < writeRecordNum) {
+      SRpcMsg* pRpcMsg = createRpcMsg(alreadySend, writeRecordNum, myIndex);
+      int32_t  ret = syncPropose(rid, pRpcMsg, false);
+      if (ret == TAOS_SYNC_PROPOSE_NOT_LEADER) {
+        sTrace("%s value%d write not leader", s, alreadySend);
+      } else {
+        assert(ret == 0);
+        sTrace("%s value%d write ok", s, alreadySend);
+      }
+      alreadySend++;
+
+      rpcFreeCont(pRpcMsg->pCont);
+      taosMemoryFree(pRpcMsg);
+    } else {
+      sTrace("%s", s);
+    }
+
+    taosMsleep(1000);
+    taosMemoryFree(s);
+    taosMsleep(1000);
+  }
+
+  syncNodeRelease(pSyncNode);
+  syncStop(rid);
+  walClose(pWal);
+  syncIOStop();
+  cleanup();
+  return 0;
+}