diff --git a/source/dnode/vnode/src/tsdb/dev/inc/tsdbFile.h b/source/dnode/vnode/src/tsdb/dev/inc/tsdbFile.h
index dc4b0505d8..abc24b8018 100644
--- a/source/dnode/vnode/src/tsdb/dev/inc/tsdbFile.h
+++ b/source/dnode/vnode/src/tsdb/dev/inc/tsdbFile.h
@@ -36,17 +36,16 @@ typedef enum {
 #define TSDB_FTYPE_MIN TSDB_FTYPE_HEAD
 #define TSDB_FTYPE_MAX (TSDB_FTYPE_TOMB + 1)
 
+// STFile
 int32_t tsdbTFileToJson(const STFile *f, cJSON *json);
 int32_t tsdbJsonToTFile(const cJSON *json, tsdb_ftype_t ftype, STFile *f);
-
-// create/destroy
-int32_t tsdbTFileCreate(const STFile *pFile, STFile **f);
-int32_t tsdbTFileDestroy(STFile *pFile);
-
-// init/clear
 int32_t tsdbTFileInit(STsdb *pTsdb, STFile *pFile);
 int32_t tsdbTFileClear(STFile *pFile);
 
+// STFileObj
+int32_t tsdbTFileObjCreate(STFileObj **fobj);
+int32_t tsdbTFileObjDestroy(STFileObj *fobj);
+
 struct STFile {
   char         fname[TSDB_FILENAME_LEN];
   tsdb_ftype_t type;
@@ -63,9 +62,9 @@ struct STFile {
 };
 
 struct STFileObj {
-  SRBTreeNode rbtn;
-  int32_t     ref;
-  STFile      f;
+  SRBTreeNode      rbtn;
+  volatile int32_t ref;
+  STFile           f;
 };
 
 #ifdef __cplusplus
diff --git a/source/dnode/vnode/src/tsdb/dev/tsdbFSet.c b/source/dnode/vnode/src/tsdb/dev/tsdbFSet.c
index 01b9012b78..ed0ad08ce4 100644
--- a/source/dnode/vnode/src/tsdb/dev/tsdbFSet.c
+++ b/source/dnode/vnode/src/tsdb/dev/tsdbFSet.c
@@ -38,8 +38,59 @@ static int32_t stt_lvl_to_json(const SSttLvl *lvl, cJSON *json) {
   return 0;
 }
 
-static int32_t stt_lvl_from_json(const cJSON *json, SSttLvl *lvl) {
-  // TODO
+static int32_t stt_file_cmpr(const SRBTreeNode *n1, const SRBTreeNode *n2) {
+  STFileObj *f1 = TCONTAINER_OF(n1, STFileObj, rbtn);
+  STFileObj *f2 = TCONTAINER_OF(n2, STFileObj, rbtn);
+  if (f1->f.cid < f2->f.cid) {
+    return -1;
+  } else if (f1->f.cid > f2->f.cid) {
+    return 1;
+  }
+  return 0;
+}
+
+static int32_t stt_lvl_init(SSttLvl *lvl) {
+  lvl->lvl = 0;
+  lvl->nstt = 0;
+  tRBTreeCreate(&lvl->sttTree, stt_file_cmpr);
+  return 0;
+}
+
+static int32_t add_file_to_stt_lvl(SSttLvl *lvl, STFileObj *fobj) {
+  lvl->nstt++;
+  tRBTreePut(&lvl->sttTree, &fobj->rbtn);
+  return 0;
+}
+
+static int32_t json_to_stt_lvl(const cJSON *json, SSttLvl *lvl) {
+  stt_lvl_init(lvl);
+
+  const cJSON *item1, *item2;
+
+  item1 = cJSON_GetObjectItem(json, "lvl");
+  if (cJSON_IsNumber(item1)) {
+    lvl->lvl = item1->valuedouble;
+  } else {
+    return TSDB_CODE_FILE_CORRUPTED;
+  }
+
+  item1 = cJSON_GetObjectItem(json, "files");
+  if (cJSON_IsArray(item1)) {
+    cJSON_ArrayForEach(item2, item1) {
+      STFileObj *fobj;
+
+      int32_t code = tsdbTFileObjCreate(&fobj);
+      if (code) return code;
+
+      code = tsdbJsonToTFile(item2, TSDB_FTYPE_STT, &fobj->f);
+      if (code) return code;
+
+      add_file_to_stt_lvl(lvl, fobj);
+    }
+  } else {
+    return TSDB_CODE_FILE_CORRUPTED;
+  }
+
   return 0;
 }
 
@@ -56,6 +107,11 @@ static int32_t add_file(STFileSet *fset, STFile *f) {
   return 0;
 }
 
+static int32_t add_stt_lvl(STFileSet *fset, SSttLvl *lvl) {
+  tRBTreePut(&fset->lvlTree, &lvl->rbtn);
+  return 0;
+}
+
 static int32_t stt_lvl_cmpr(const SRBTreeNode *n1, const SRBTreeNode *n2) {
   SSttLvl *lvl1 = TCONTAINER_OF(n1, SSttLvl, rbtn);
   SSttLvl *lvl2 = TCONTAINER_OF(n2, SSttLvl, rbtn);
@@ -109,37 +165,48 @@ int32_t tsdbFileSetToJson(const STFileSet *fset, cJSON *json) {
 }
 
 int32_t tsdbJsonToFileSet(const cJSON *json, STFileSet *fset) {
-  const cJSON *item;
+  const cJSON *item1, *item2;
 
   fset_init(fset);
 
   /* fid */
-  item = cJSON_GetObjectItem(json, "fid");
-  if (cJSON_IsNumber(item)) {
-    fset->fid = item->valueint;
+  item1 = cJSON_GetObjectItem(json, "fid");
+  if (cJSON_IsNumber(item1)) {
+    fset->fid = item1->valueint;
   } else {
     return TSDB_CODE_FILE_CORRUPTED;
   }
 
   int32_t code;
+  STFile  tf;
   for (int32_t ftype = TSDB_FTYPE_MIN; ftype < TSDB_FTYPE_MAX; ++ftype) {
-    STFile tf;
     code = tsdbJsonToTFile(json, ftype, &tf);
     if (code == TSDB_CODE_NOT_FOUND) {
       continue;
     } else if (code) {
       return code;
     } else {
-      // TODO
-      // code = tsdbFileObjCreate(&tf, &fset->farr[ftype]);
-      // if (code) return code;
+      code = tsdbTFileObjCreate(&fset->farr[ftype]);
+      if (code) return code;
+      fset->farr[ftype]->f = tf;
     }
   }
 
   // each level
-  item = cJSON_GetObjectItem(json, "stt");
-  if (cJSON_IsArray(item)) {
-    // TODO
+  item1 = cJSON_GetObjectItem(json, "stt");
+  if (cJSON_IsArray(item1)) {
+    cJSON_ArrayForEach(item2, item1) {
+      SSttLvl *lvl = taosMemoryCalloc(1, sizeof(*lvl));
+      if (lvl == NULL) return TSDB_CODE_OUT_OF_MEMORY;
+
+      code = json_to_stt_lvl(item2, lvl);
+      if (code) {
+        taosMemoryFree(lvl);
+        return code;
+      }
+
+      add_stt_lvl(fset, lvl);
+    }
   } else {
     return TSDB_CODE_FILE_CORRUPTED;
   }
diff --git a/source/dnode/vnode/src/tsdb/dev/tsdbFile.c b/source/dnode/vnode/src/tsdb/dev/tsdbFile.c
index 470e087c89..9a824fbe6c 100644
--- a/source/dnode/vnode/src/tsdb/dev/tsdbFile.c
+++ b/source/dnode/vnode/src/tsdb/dev/tsdbFile.c
@@ -232,17 +232,17 @@ int32_t tsdbJsonToTFile(const cJSON *json, tsdb_ftype_t ftype, STFile *f) {
   return 0;
 }
 
-int32_t tsdbTFileCreate(const STFile *pFile, STFile **f) {
-  f[0] = taosMemoryMalloc(sizeof(*f[0]));
-  if (f[0] == NULL) return TSDB_CODE_OUT_OF_MEMORY;
+int32_t tsdbTFileObjCreate(STFileObj **fobj) {
+  fobj[0] = taosMemoryMalloc(sizeof(STFileObj));
+  if (fobj[0] == NULL) return TSDB_CODE_OUT_OF_MEMORY;
 
-  *f[0] = *pFile;
-
-  // f[0]->ref = 1;
+  fobj[0]->ref = 1;
+  // TODO
   return 0;
 }
 
-int32_t tsdbTFileDestroy(STFile *pFile) {
-  taosMemoryFree(pFile);
+int32_t tsdbTFileObjDestroy(STFileObj *fobj) {
+  // TODO
+  taosMemoryFree(fobj);
   return 0;
-}
\ No newline at end of file
+}