diff --git a/source/libs/index/inc/index_fst_counting_writer.h b/source/libs/index/inc/index_fst_counting_writer.h
index db1f063af3..ba0bd52e10 100644
--- a/source/libs/index/inc/index_fst_counting_writer.h
+++ b/source/libs/index/inc/index_fst_counting_writer.h
@@ -31,6 +31,7 @@ typedef struct WriterCtx {
   int (*write)(struct WriterCtx* ctx, uint8_t* buf, int len);
   int (*read)(struct WriterCtx* ctx, uint8_t* buf, int len);
   int (*flush)(struct WriterCtx* ctx);
+  int (*readFrom)(struct WriterCtx* ctx, uint8_t* buf, int len, int32_t offset);
   WriterType type;
   union {
     struct {
@@ -48,6 +49,7 @@ typedef struct WriterCtx {
 
 static int writeCtxDoWrite(WriterCtx* ctx, uint8_t* buf, int len);
 static int writeCtxDoRead(WriterCtx* ctx, uint8_t* buf, int len);
+static int writeCtxDoReadFrom(WriterCtx* ctx, uint8_t* buf, int len, int32_t offset);
 static int writeCtxDoFlush(WriterCtx* ctx);
 
 WriterCtx* writerCtxCreate(WriterType type, const char* path, bool readOnly, int32_t capacity);
diff --git a/source/libs/index/src/index_fst_counting_writer.c b/source/libs/index/src/index_fst_counting_writer.c
index 60d717efc6..962973bb5c 100644
--- a/source/libs/index/src/index_fst_counting_writer.c
+++ b/source/libs/index/src/index_fst_counting_writer.c
@@ -39,6 +39,17 @@ static int writeCtxDoRead(WriterCtx* ctx, uint8_t* buf, int len) {
 
   return nRead;
 }
+static int writeCtxDoReadFrom(WriterCtx* ctx, uint8_t* buf, int len, int32_t offset) {
+  int nRead = 0;
+  if (ctx->type == TFile) {
+    tfLseek(ctx->file.fd, offset, 0);
+    nRead = tfRead(ctx->file.fd, buf, len);
+  } else {
+    // refactor later
+    assert(0);
+  }
+  return nRead;
+}
 static int writeCtxDoFlush(WriterCtx* ctx) {
   if (ctx->type == TFile) {
     // tfFsync(ctx->fd);
@@ -73,6 +84,7 @@ WriterCtx* writerCtxCreate(WriterType type, const char* path, bool readOnly, int
   ctx->write = writeCtxDoWrite;
   ctx->read = writeCtxDoRead;
   ctx->flush = writeCtxDoFlush;
+  ctx->readFrom = writeCtxDoReadFrom;
 
   ctx->offset = 0;
   ctx->limit = capacity;
diff --git a/source/libs/index/src/index_tfile.c b/source/libs/index/src/index_tfile.c
index 39100edd8b..6ac1a893a6 100644
--- a/source/libs/index/src/index_tfile.c
+++ b/source/libs/index/src/index_tfile.c
@@ -34,18 +34,19 @@ typedef struct TFileValue {
 static int  tfileValueCompare(const void* a, const void* b, const void* param);
 static void tfileSerialTableIdsToBuf(char* buf, SArray* tableIds);
 
-static int tfileWriteFstOffset(TFileWriter* tw, int32_t offset);
 static int tfileWriteHeader(TFileWriter* writer);
+static int tfileWriteFstOffset(TFileWriter* tw, int32_t offset);
 static int tfileWriteData(TFileWriter* write, TFileValue* tval);
 
 static int tfileReadLoadHeader(TFileReader* reader);
+static int tfileReadLoadFst(TFileReader* reader);
+static int tfileReadLoadTableIds(TFileReader* reader, int32_t offset, SArray* result);
 
 static int  tfileGetFileList(const char* path, SArray* result);
 static void tfileDestroyFileName(void* elem);
 static int  tfileCompare(const void* a, const void* b);
 static int  tfileParseFileName(const char* filename, uint64_t* suid, int* colId, int* version);
 static void tfileSerialCacheKey(TFileCacheKey* key, char* buf);
-// static tfileGetCompareFunc(uint8_t byte) {}
 
 TFileCache* tfileCacheCreate(const char* path) {
   TFileCache* tcache = calloc(1, sizeof(TFileCache));
@@ -73,9 +74,13 @@ TFileCache* tfileCacheCreate(const char* path) {
     TFileReader* reader = tfileReaderCreate(wc);
     if (0 != tfileReadLoadHeader(reader)) {
       tfileReaderDestroy(reader);
-      indexError("failed to load index header, index Id: %s", file);
+      indexError("failed to load index header, index file: %s", file);
       goto End;
     }
+    if (0 != tfileReadLoadFst(reader)) {
+      tfileReaderDestroy(reader);
+      indexError("failed to load index fst, index file: %s", file);
+    }
     // loader fst and validate it
 
     TFileHeader*  header = &reader->header;
@@ -136,25 +141,29 @@ TFileReader* tfileReaderCreate(WriterCtx* ctx) {
 void tfileReaderDestroy(TFileReader* reader) {
   if (reader == NULL) { return; }
   // T_REF_INC(reader);
+  fstDestroy(reader->fst);
   writerCtxDestroy(reader->ctx);
   free(reader);
 }
 
 int tfileReaderSearch(TFileReader* reader, SIndexTermQuery* query, SArray* result) {
   SIndexTerm* term = query->term;
+
   // refactor to callback later
   if (query->qType == QUERY_TERM) {
     uint64_t offset;
     FstSlice key = fstSliceCreate(term->colVal, term->nColVal);
     if (fstGet(reader->fst, &key, &offset)) {
-      //
+      return tfileReadLoadTableIds(reader, offset, result);
     } else {
       indexInfo("index: %" PRIu64 ", col: %s, colVal: %s, not found in tindex", term->suid, term->colName, term->colVal);
     }
     return 0;
   } else if (query->qType == QUERY_PREFIX) {
+    // handle later
     //
-    //
+  } else {
+    // handle later
   }
   return 0;
 }
@@ -198,13 +207,10 @@ int tfileWriterPut(TFileWriter* tw, void* data) {
     TFileValue* v = taosArrayGetP((SArray*)data, i);
 
     int32_t tbsz = taosArrayGetSize(v->tableId);
-    int32_t ttsz = TF_TABLE_TATOAL_SIZE(tbsz);
-    fstOffset += ttsz;
+    fstOffset += TF_TABLE_TATOAL_SIZE(tbsz);
   }
   // check result or not
   tfileWriteFstOffset(tw, fstOffset);
-  // tw->ctx->header.fstOffset = fstOffset;
-  // tw->ctx->write(tw->ctx, &fstOffset, sizeof(fstOffset));
 
   for (size_t i = 0; i < sz; i++) {
     TFileValue* v = taosArrayGetP((SArray*)data, i);
@@ -287,11 +293,11 @@ static int tfileValueCompare(const void* a, const void* b, const void* param) {
 
   return fn(av->colVal, bv->colVal);
 }
-static void tfileSerialTableIdsToBuf(char* buf, SArray* tableIds) {
-  int tbSz = taosArrayGetSize(tableIds);
-  SERIALIZE_VAR_TO_BUF(buf, tbSz, int32_t);
-  for (size_t i = 0; i < tbSz; i++) {
-    uint64_t* v = taosArrayGet(tableIds, i);
+static void tfileSerialTableIdsToBuf(char* buf, SArray* ids) {
+  int sz = taosArrayGetSize(ids);
+  SERIALIZE_VAR_TO_BUF(buf, sz, int32_t);
+  for (size_t i = 0; i < sz; i++) {
+    uint64_t* v = taosArrayGet(ids, i);
     SERIALIZE_VAR_TO_BUF(buf, *v, uint64_t);
   }
 }
@@ -328,6 +334,7 @@ static int tfileWriteData(TFileWriter* write, TFileValue* tval) {
   } else {
     // handle other type later
   }
+  return 0;
 }
 static int tfileReadLoadHeader(TFileReader* reader) {
   // TODO simple tfile header later
@@ -339,6 +346,42 @@ static int tfileReadLoadHeader(TFileReader* reader) {
   memcpy(&reader->header, buf, sizeof(buf));
   return 0;
 }
+static int tfileReadLoadFst(TFileReader* reader) {
+  // current load fst into memory, refactor it later
+  static int FST_MAX_SIZE = 16 * 1024;
+
+  char* buf = calloc(1, sizeof(char) * FST_MAX_SIZE);
+  if (buf == NULL) { return -1; }
+
+  WriterCtx* ctx = reader->ctx;
+  int32_t    nread = ctx->readFrom(ctx, buf, FST_MAX_SIZE, reader->header.fstOffset);
+  // we assuse fst size less than FST_MAX_SIZE
+  assert(nread > 0 && nread < FST_MAX_SIZE);
+
+  FstSlice st = fstSliceCreate((uint8_t*)buf, nread);
+  reader->fst = fstCreate(&st);
+  free(buf);
+  fstSliceDestroy(&st);
+
+  return reader->fst == NULL ? 0 : -1;
+}
+static int tfileReadLoadTableIds(TFileReader* reader, int32_t offset, SArray* result) {
+  int32_t    nid;
+  WriterCtx* ctx = reader->ctx;
+  int32_t    nread = ctx->readFrom(ctx, (char*)&nid, sizeof(nid), offset);
+  assert(sizeof(nid) == nread);
+
+  char* buf = calloc(1, sizeof(uint64_t) * nid);
+  if (buf == NULL) { return -1; }
+
+  nread = ctx->read(ctx, buf, sizeof(uint64_t) * nid);
+  uint64_t* ids = (uint64_t*)buf;
+  for (int32_t i = 0; i < nid; i++) {
+    taosArrayPush(result, ids + i);
+  }
+  free(buf);
+  return 0;
+}
 
 static int tfileGetFileList(const char* path, SArray* result) {
   DIR* dir = opendir(path);