diff --git a/source/libs/index/inc/index_fst.h b/source/libs/index/inc/index_fst.h
index 7ab9358cd15a33b051f67b0b17eb599491fab42d..87d740ddd9ad86f08cae75347ba33bf15f6f020c 100644
--- a/source/libs/index/inc/index_fst.h
+++ b/source/libs/index/inc/index_fst.h
@@ -80,6 +80,9 @@ void fstBuilderInsertOutput(FstBuilder *b, FstSlice bs, Output in);
 OrderType fstBuilderCheckLastKey(FstBuilder *b, FstSlice bs, bool ckDup);
 void fstBuilderCompileFrom(FstBuilder *b, uint64_t istate);
 CompiledAddr fstBuilderCompile(FstBuilder *b, FstBuilderNode *bn);
+void* fstBuilerIntoInner(FstBuilder *b);
+void  fstBuilderFinish(FstBuilder *b); 
+
 
 
 
diff --git a/source/libs/index/inc/index_fst_counting_writer.h b/source/libs/index/inc/index_fst_counting_writer.h
index fbb2f1cff7b643c710e0d2f551e7d2a2c05b543b..465080403482c6022900eed2e3a4fe98aecb30de 100644
--- a/source/libs/index/inc/index_fst_counting_writer.h
+++ b/source/libs/index/inc/index_fst_counting_writer.h
@@ -27,9 +27,11 @@ typedef struct FstCountingWriter {
 
 uint64_t fstCountingWriterWrite(FstCountingWriter *write, uint8_t *buf, uint32_t bufLen); 
 
-int FstCountingWriterFlush(FstCountingWriter *write);
+int fstCountingWriterFlush(FstCountingWriter *write);
 
 
+uint32_t fstCountingWriterMaskedCheckSum(FstCountingWriter *write);
+
 FstCountingWriter *fstCountingWriterCreate(void *wtr);
 void fstCountingWriterDestroy(FstCountingWriter *w); 
 
diff --git a/source/libs/index/src/index_fst.c b/source/libs/index/src/index_fst.c
index 8b9aa22fc689adb48887cdc493c69ffb266b769b..f8fc40fcb6f6116d3ceba7d5f24ba1ab40065293 100644
--- a/source/libs/index/src/index_fst.c
+++ b/source/libs/index/src/index_fst.c
@@ -14,7 +14,7 @@
  */
 
 #include "index_fst.h"
-
+#include "tcoding.h"
 
 
 static void fstPackDeltaIn(FstCountingWriter *wrt, CompiledAddr nodeAddr, CompiledAddr transAddr, uint8_t nBytes) {
@@ -98,7 +98,7 @@ void fstUnFinishedNodesAddSuffix(FstUnFinishedNodes *nodes, FstSlice bs, Output
   FstBuilderNodeUnfinished *un = taosArrayGet(nodes->stack, sz);
   assert(un->last == NULL);
 
-  
+     
   
   //FstLastTransition *trn = malloc(sizeof(FstLastTransition)); 
   //trn->inp = s->data[s->start]; 
@@ -849,6 +849,31 @@ CompiledAddr fstBuilderCompile(FstBuilder *b, FstBuilderNode *bn) {
   return b->lastAddr;  
 }
 
+void* fstBuilderInsertInner(FstBuilder *b) {
+  fstBuilderCompileFrom(b, 0);  
+  FstBuilderNode *rootNode = fstUnFinishedNodesPopRoot(b->unfinished); 
+  CompiledAddr  rootAddr = fstBuilderCompile(b, rootNode);
+
+  uint8_t buf64[8] = {0}; 
+
+  taosEncodeFixedU64((void **)&buf64, b->len); 
+  fstCountingWriterWrite(b->wrt, buf64, sizeof(buf64));  
+    
+  taosEncodeFixedU64((void **)&buf64, rootAddr);  
+  fstCountingWriterWrite(b->wrt, buf64, sizeof(buf64));  
+
+  uint8_t buf32[4] = {0};
+  uint32_t sum = fstCountingWriterMaskedCheckSum(b->wrt);
+  taosEncodeFixedU32((void **)&buf32, sum); 
+  fstCountingWriterWrite(b->wrt, buf32, sizeof(buf32));  
+  
+  fstCountingWriterFlush(b->wrt);
+  return b->wrt;
+  
+}
+void fstBuilderFinish(FstBuilder *b) {
+  fstBuilderInsertInner(b);
+}
 
 
 
diff --git a/source/libs/index/src/index_fst_counting_writer.c b/source/libs/index/src/index_fst_counting_writer.c
index b253db986a1612fc1322e9d049bd9690a401a5d1..a0a2c380f170724984dae7bc9e12864d4ce16f24 100644
--- a/source/libs/index/src/index_fst_counting_writer.c
+++ b/source/libs/index/src/index_fst_counting_writer.c
@@ -37,6 +37,9 @@ uint64_t fstCountingWriterWrite(FstCountingWriter *write, uint8_t *buf, uint32_t
   return bufLen; 
 } 
 
+uint32_t fstCountingWriterMaskedCheckSum(FstCountingWriter *write) {
+  return 0;
+}
 int fstCountingWriterFlush(FstCountingWriter *write) {
   //write->wtr->flush
   return 1;