diff --git a/include/libs/stream/tstream.h b/include/libs/stream/tstream.h
index e586b1a028..50642f9c7d 100644
--- a/include/libs/stream/tstream.h
+++ b/include/libs/stream/tstream.h
@@ -103,7 +103,7 @@ typedef struct {
 } SStreamQueueItem;
 
 typedef void    FTbSink(SStreamTask* pTask, void* vnode, int64_t ver, void* data);
-typedef int32_t FTaskExpand(void* ahandle, SStreamTask* pTask, int64_t ver, int64_t checkpointId);
+typedef int32_t FTaskExpand(void* ahandle, SStreamTask* pTask, int64_t ver);
 
 typedef struct {
   int8_t      type;
diff --git a/source/dnode/vnode/src/inc/tq.h b/source/dnode/vnode/src/inc/tq.h
index 5d99929c69..584b238d1b 100644
--- a/source/dnode/vnode/src/inc/tq.h
+++ b/source/dnode/vnode/src/inc/tq.h
@@ -168,7 +168,7 @@ char*   tqOffsetBuildFName(const char* path, int32_t fVer);
 int32_t tqOffsetRestoreFromFile(STqOffsetStore* pStore, const char* fname);
 
 // tqStream
-int32_t tqExpandTask(STQ* pTq, SStreamTask* pTask, int64_t ver, int64_t checkpointId);
+int32_t tqExpandTask(STQ* pTq, SStreamTask* pTask, int64_t ver);
 int32_t tqStreamTasksScanWal(STQ* pTq);
 int32_t tqStreamTasksStatusCheck(STQ* pTq);
 
diff --git a/source/dnode/vnode/src/tq/tq.c b/source/dnode/vnode/src/tq/tq.c
index 848468d3e0..5c2d23db20 100644
--- a/source/dnode/vnode/src/tq/tq.c
+++ b/source/dnode/vnode/src/tq/tq.c
@@ -743,7 +743,7 @@ end:
 
 void freePtr(void* ptr) { taosMemoryFree(*(void**)ptr); }
 
-int32_t tqExpandTask(STQ* pTq, SStreamTask* pTask, int64_t ver, int64_t checkpointId) {
+int32_t tqExpandTask(STQ* pTq, SStreamTask* pTask, int64_t ver) {
   int32_t vgId = TD_VID(pTq->pVnode);
 
   pTask->id.idStr = createStreamTaskIdStr(pTask->id.streamId, pTask->id.taskId);
diff --git a/source/libs/stream/src/streamBackendRocksdb.c b/source/libs/stream/src/streamBackendRocksdb.c
index 24b675884c..bf05437117 100644
--- a/source/libs/stream/src/streamBackendRocksdb.c
+++ b/source/libs/stream/src/streamBackendRocksdb.c
@@ -144,12 +144,46 @@ SCfInit ginitDict[] = {
      encodeValueFunc, decodeValueFunc},
 };
 
-int32_t streamBackendRebuildDirFromCheckpoint(const char* stateDir, const char* chkpDir) {
-  // impl later
+bool isValidCheckpoint(const char* dir) { return true; }
 
-  return 0;
+int32_t copyFiles(const char* src, const char* dst) {
+  int32_t code = 0;
+  // opt later, just hard link
+  int32_t sLen = strlen(src);
+  int32_t dLen = strlen(dst);
+  char*   absSrcPath = taosMemoryCalloc(1, sLen + 64);
+  char*   absDstPath = taosMemoryCalloc(1, dLen + 64);
+
+  TdDirPtr pDir = taosOpenDir(src);
+  if (pDir == NULL) return 0;
+
+  TdDirEntryPtr de = NULL;
+
+  while ((de = taosReadDir(pDir)) != NULL) {
+    char* name = taosGetDirEntryName(de);
+    if (strcmp(name, ".") == 0 || strcmp(name, "..") == 0) continue;
+
+    sprintf(absSrcPath, "%s/%s", src, name);
+    sprintf(absDstPath, "%s/%s", dst, name);
+    if (!taosDirEntryIsDir(de)) {
+      code = taosCopyFile(absSrcPath, absDstPath);
+      if (code == -1) {
+        goto _err;
+      }
+    }
+
+    memset(absSrcPath, 0, sLen + 64);
+    memset(absDstPath, 0, dLen + 64);
+  }
+
+_err:
+  taosMemoryFreeClear(absSrcPath);
+  taosMemoryFreeClear(absDstPath);
+  taosCloseDir(&pDir);
+  return code;
 }
-void* streamBackendInit(const char* path, int64_t chkpId) {
+int32_t rebuildDirFromCheckpoint(const char* path, int64_t chkpId, char** dst) {
+  // impl later
   int32_t code = 0;
   char*   state = taosMemoryCalloc(1, strlen(path) + 32);
 
@@ -157,14 +191,14 @@ void* streamBackendInit(const char* path, int64_t chkpId) {
   if (chkpId != 0) {
     char* chkp = taosMemoryCalloc(1, strlen(path) + 64);
     sprintf(chkp, "%s/%s/checkpoint-%" PRId64 "", path, "checkpoints", chkpId);
-    if (taosIsDir(chkp)) {
+    if (taosIsDir(chkp) && isValidCheckpoint(chkp)) {
       if (taosIsDir(state)) {
         // remove dir if exists
         // taosRenameFile(const char *oldName, const char *newName)
         taosRemoveDir(state);
       }
       taosMkDir(state);
-      code = streamBackendRebuildDirFromCheckpoint(state, chkp);
+      code = copyFiles(chkp, state);
       if (code != 0) {
         qError("failed to restart stream backend from  %s, reason: %s", chkp, tstrerror(TAOS_SYSTEM_ERROR(errno)));
       }
@@ -174,9 +208,16 @@ void* streamBackendInit(const char* path, int64_t chkpId) {
       taosMkDir(state);
     }
   }
+  *dst = state;
 
+  return 0;
+}
+void* streamBackendInit(const char* path, int64_t chkpId) {
   uint32_t dbMemLimit = nextPow2(tsMaxStreamBackendCache) << 20;
 
+  char*   state = NULL;
+  int32_t code = rebuildDirFromCheckpoint(path, chkpId, &state);
+
   qDebug("start to init stream backend at %s", state);
   SBackendWrapper* pHandle = taosMemoryCalloc(1, sizeof(SBackendWrapper));
   pHandle->list = tdListNew(sizeof(SCfComparator));
@@ -232,6 +273,7 @@ void* streamBackendInit(const char* path, int64_t chkpId) {
     rocksdb_list_column_families_destroy(cfs, nCf);
   }
   qDebug("succ to init stream backend at %s, backend:%p", state, pHandle);
+  taosMemoryFreeClear(state);
 
   return (void*)pHandle;
 _EXIT:
@@ -243,6 +285,7 @@ _EXIT:
   taosHashCleanup(pHandle->cfInst);
   rocksdb_compactionfilterfactory_destroy(pHandle->filterFactory);
   tdListFree(pHandle->list);
+  taosMemoryFree(state);
   taosMemoryFree(pHandle);
   qDebug("failed to init stream backend at %s", path);
   return NULL;
diff --git a/source/libs/stream/src/streamMeta.c b/source/libs/stream/src/streamMeta.c
index 39bf1fd55e..2976a65d1d 100644
--- a/source/libs/stream/src/streamMeta.c
+++ b/source/libs/stream/src/streamMeta.c
@@ -249,7 +249,7 @@ int32_t streamMetaAddDeployedTask(SStreamMeta* pMeta, int64_t ver, SStreamTask*
 
   void* p = taosHashGet(pMeta->pTasks, &pTask->id.taskId, sizeof(pTask->id.taskId));
   if (p == NULL) {
-    if (pMeta->expandFunc(pMeta->ahandle, pTask, ver, checkpointId) < 0) {
+    if (pMeta->expandFunc(pMeta->ahandle, pTask, ver) < 0) {
       tFreeStreamTask(pTask);
       return -1;
     }
@@ -447,8 +447,6 @@ _err:
   return chkpId;
 }
 int32_t streamLoadTasks(SStreamMeta* pMeta, int64_t ver) {
-  int64_t checkpointId = 0;
-
   TBC* pCur = NULL;
   if (tdbTbcOpen(pMeta->pTaskDb, &pCur, NULL) < 0) {
     return -1;
@@ -477,7 +475,7 @@ int32_t streamLoadTasks(SStreamMeta* pMeta, int64_t ver) {
     // remove duplicate
     void* p = taosHashGet(pMeta->pTasks, &pTask->id.taskId, sizeof(pTask->id.taskId));
     if (p == NULL) {
-      if (pMeta->expandFunc(pMeta->ahandle, pTask, pTask->chkInfo.checkpointVer, checkpointId) < 0) {
+      if (pMeta->expandFunc(pMeta->ahandle, pTask, pTask->chkInfo.checkpointVer) < 0) {
         tdbFree(pKey);
         tdbFree(pVal);
         tdbTbcClose(pCur);