diff --git a/source/dnode/vnode/src/tsdb/tsdbReaderWriter.c b/source/dnode/vnode/src/tsdb/tsdbReaderWriter.c
index 1addb60997ac3e5cb5acfe192bdb4910649a7399..50fd9d7aa7035adbfe8d17fde078b301483fe015 100644
--- a/source/dnode/vnode/src/tsdb/tsdbReaderWriter.c
+++ b/source/dnode/vnode/src/tsdb/tsdbReaderWriter.c
@@ -47,7 +47,9 @@ static int32_t tsdbOpenFile(const char *path, int32_t szPage, int32_t flag, STsd
     taosMemoryFree(pFD);
     goto _exit;
   }
-  if (flag == TD_FILE_READ) {
+
+  // not check file size when reading data files.
+  if (flag != TD_FILE_READ) {
     if (taosStatFile(path, &pFD->szFile, NULL) < 0) {
       code = TAOS_SYSTEM_ERROR(errno);
       taosMemoryFree(pFD->pBuf);
@@ -55,9 +57,11 @@ static int32_t tsdbOpenFile(const char *path, int32_t szPage, int32_t flag, STsd
       taosMemoryFree(pFD);
       goto _exit;
     }
+
     ASSERT(pFD->szFile % szPage == 0);
     pFD->szFile = pFD->szFile / szPage;
   }
+
   *ppFD = pFD;
 
 _exit: