diff --git a/source/dnode/vnode/src/tsdb/dev/inc/tsdbFSet.h b/source/dnode/vnode/src/tsdb/dev/inc/tsdbFSet.h
index 063362db23..bc94e27cc3 100644
--- a/source/dnode/vnode/src/tsdb/dev/inc/tsdbFSet.h
+++ b/source/dnode/vnode/src/tsdb/dev/inc/tsdbFSet.h
@@ -29,6 +29,12 @@ typedef TARRAY2(STFileObj *) TFileObjArray;
 typedef TARRAY2(SSttLvl *) TSttLvlArray;
 typedef TARRAY2(STFileOp) TFileOpArray;
 
+typedef enum {
+  TSDB_FOP_CREATE = 1,
+  TSDB_FOP_REMOVE,
+  TSDB_FOP_MODIFY,
+} tsdb_fop_t;
+
 // init/clear
 int32_t tsdbTFileSetInit(int32_t fid, STFileSet **fset);
 int32_t tsdbTFileSetInitEx(STsdb *pTsdb, const STFileSet *fset1, STFileSet **fset);
@@ -50,10 +56,10 @@ SSttLvl *tsdbTFileSetGetLvl(STFileSet *fset, int32_t level);
 bool tsdbTFileSetIsEmpty(const STFileSet *fset);
 
 struct STFileOp {
-  int32_t fid;
-  STFile *of;  // old file
-  STFile *nf;  // new file
-  STFile  fArr[2];
+  int32_t    fid;
+  tsdb_fop_t optype;
+  STFile     of;  // old file state
+  STFile     nf;  // new file state
 };
 
 struct SSttLvl {
diff --git a/source/dnode/vnode/src/tsdb/dev/tsdbFSet.c b/source/dnode/vnode/src/tsdb/dev/tsdbFSet.c
index f13ba6887f..d4cf89b144 100644
--- a/source/dnode/vnode/src/tsdb/dev/tsdbFSet.c
+++ b/source/dnode/vnode/src/tsdb/dev/tsdbFSet.c
@@ -256,38 +256,68 @@ int32_t tsdbJsonToTFileSet(STsdb *pTsdb, const cJSON *json, STFileSet **fset) {
   return 0;
 }
 
+// NOTE: the api does not remove file, only do memory operation
 int32_t tsdbTFileSetEdit(STsdb *pTsdb, STFileSet *fset, const STFileOp *op) {
   int32_t code = 0;
 
-  // if (op->of.size == 0  //
-  //     || 0              /* TODO*/
-  // ) {
-  //   STFileObj *fobj;
-  //   code = tsdbTFileObjInit(pTsdb, &op->nf, &fobj);
-  //   if (code) return code;
+  if (op->optype == TSDB_FOP_CREATE) {
+    // create a new file
+    STFileObj *fobj;
+    code = tsdbTFileObjInit(pTsdb, &op->nf, &fobj);
+    if (code) return code;
 
-  //   if (fobj->f.type == TSDB_FTYPE_STT) {
-  //     SSttLvl *lvl = tsdbTFileSetGetLvl(fset, fobj->f.stt.level);
-  //     if (!lvl) {
-  //       code = tsdbSttLvlInit(fobj->f.stt.level, &lvl);
-  //       if (code) return code;
+    if (fobj->f.type == TSDB_FTYPE_STT) {
+      SSttLvl *lvl = tsdbTFileSetGetLvl(fset, fobj->f.stt.level);
+      if (!lvl) {
+        code = tsdbSttLvlInit(fobj->f.stt.level, &lvl);
+        if (code) return code;
 
-  //       code = TARRAY2_SORT_INSERT(&fset->lvlArr, lvl, tsdbSttLvlCmprFn);
-  //       if (code) return code;
-  //     }
+        code = TARRAY2_SORT_INSERT(&fset->lvlArr, lvl, tsdbSttLvlCmprFn);
+        if (code) return code;
+      }
 
-  //     code = TARRAY2_SORT_INSERT(&lvl->farr, fobj, tsdbTFileObjCmpr);
-  //     if (code) return code;
-  //   } else {
-  //     fset->farr[fobj->f.type] = fobj;
-  //   }
-  // } else if (op->nf.size == 0) {
-  //   // delete
-  //   ASSERT(0);
-  // } else {
-  //   // modify
-  //   ASSERT(0);
-  // }
+      code = TARRAY2_SORT_INSERT(&lvl->farr, fobj, tsdbTFileObjCmpr);
+      if (code) return code;
+    } else {
+      ASSERT(fset->farr[fobj->f.type] == NULL);
+      fset->farr[fobj->f.type] = fobj;
+    }
+  } else if (op->optype == TSDB_FOP_REMOVE) {
+    // delete a file
+    if (op->of.type == TSDB_FTYPE_STT) {
+      SSttLvl *lvl = tsdbTFileSetGetLvl(fset, op->of.stt.level);
+      ASSERT(lvl);
+
+      STFileObj  tfobj = {.f = {.cid = op->of.cid}};
+      STFileObj *tfobjp = &tfobj;
+      int32_t    idx = TARRAY2_SEARCH_IDX(&lvl->farr, &tfobjp, tsdbTFileObjCmpr, TD_EQ);
+      ASSERT(idx >= 0);
+      TARRAY2_REMOVE(&lvl->farr, idx, tsdbSttLvlRemoveFObj);
+
+      if (TARRAY2_SIZE(&lvl->farr) == 0) {
+        // TODO: remove the stt level if no file exists anymore
+        // TARRAY2_REMOVE(&fset->lvlArr, lvl - fset->lvlArr.data, tsdbSttLvlClear);
+      }
+    } else {
+      ASSERT(tsdbIsSameTFile(&op->of, &fset->farr[op->of.type]->f));
+      tsdbTFileObjUnref(fset->farr[op->of.type]);
+      fset->farr[op->of.type] = NULL;
+    }
+  } else {
+    if (op->nf.type == TSDB_FTYPE_STT) {
+      SSttLvl *lvl = tsdbTFileSetGetLvl(fset, op->of.stt.level);
+      ASSERT(lvl);
+
+      STFileObj tfobj = {.f = {.cid = op->of.cid}}, *tfobjp = &tfobj;
+      tfobjp = TARRAY2_SEARCH_EX(&lvl->farr, &tfobjp, tsdbTFileObjCmpr, TD_EQ);
+
+      ASSERT(tfobjp);
+
+      tfobjp->f = op->nf;
+    } else {
+      fset->farr[op->nf.type]->f = op->nf;
+    }
+  }
 
   return 0;
 }
diff --git a/source/dnode/vnode/src/tsdb/dev/tsdbSttFReaderWriter.c b/source/dnode/vnode/src/tsdb/dev/tsdbSttFReaderWriter.c
index 94410ac1be..855f92799d 100644
--- a/source/dnode/vnode/src/tsdb/dev/tsdbSttFReaderWriter.c
+++ b/source/dnode/vnode/src/tsdb/dev/tsdbSttFReaderWriter.c
@@ -573,13 +573,12 @@ int32_t tsdbSttFWriterClose(SSttFileWriter **ppWriter, int8_t abort, struct STFi
       STFile *f = &ppWriter[0]->config.file;
       op->fid = f->fid;
       if (f->size == 0) {
-        op->of = NULL;
+        op->optype = TSDB_FOP_CREATE;
       } else {
-        op->of = &op->fArr[0];
-        op->of[0] = f[0];
+        op->optype = TSDB_FOP_MODIFY;
       }
-      op->nf = &op->fArr[1];
-      op->nf[0] = ppWriter[0]->tFile;
+      op->of = f[0];
+      op->nf = ppWriter[0]->tFile;
     }
   }