diff --git a/source/libs/index/CMakeLists.txt b/source/libs/index/CMakeLists.txt
index 3da2c93b39..f68fc5e61e 100644
--- a/source/libs/index/CMakeLists.txt
+++ b/source/libs/index/CMakeLists.txt
@@ -9,6 +9,7 @@ target_link_libraries(
     index 
     PUBLIC os
     PUBLIC util
+    PUBLIC common
 )
 
 if (${BUILD_WITH_LUCENE})
diff --git a/source/libs/index/inc/index_cache.h b/source/libs/index/inc/index_cache.h
index ff915a3930..39107a78ac 100644
--- a/source/libs/index/inc/index_cache.h
+++ b/source/libs/index/inc/index_cache.h
@@ -17,6 +17,7 @@
 
 #include "index.h"
 #include "tlockfree.h"
+#include "tskiplist.h"
 // ----------------- row structure in skiplist ---------------------
 
 /* A data row, the format is like below:
@@ -30,6 +31,7 @@ extern "C" {
 
 typedef struct IndexCache {
   T_REF_DECLARE() 
+  SSkipList *skiplist;
 } IndexCache;
 
 
diff --git a/source/libs/index/inc/index_fst.h b/source/libs/index/inc/index_fst.h
index 20037f829a..0dcc25831c 100644
--- a/source/libs/index/inc/index_fst.h
+++ b/source/libs/index/inc/index_fst.h
@@ -315,7 +315,6 @@ typedef struct StreamWithStateResult {
   FstSlice data;  
   FstOutput out;
   void     *state; 
-
 } StreamWithStateResult;
 
 StreamWithStateResult *swsResultCreate(FstSlice *data, FstOutput fOut, void *state);
diff --git a/source/libs/index/src/index_cache.c b/source/libs/index/src/index_cache.c
index 2ecc823ef9..acb8e32157 100644
--- a/source/libs/index/src/index_cache.c
+++ b/source/libs/index/src/index_cache.c
@@ -14,7 +14,13 @@
  */
 
 #include "index_cache.h"
+#include "tcompare.h"
 
+#define MAX_INDEX_KEY_LEN 128 // test only, change later
+
+static char*  getIndexKey(const void *pData) {
+  return NULL;  
+} 
 static int32_t compareKey(const void *l, const void *r) {
   char *lp = (char *)l;
   char *rp = (char *)r;
@@ -85,10 +91,14 @@ static int32_t compareKey(const void *l, const void *r) {
 } 
 IndexCache *indexCacheCreate() {
   IndexCache *cache = calloc(1, sizeof(IndexCache));
+  cache->skiplist = tSkipListCreate(MAX_SKIP_LIST_LEVEL, TSDB_DATA_TYPE_BINARY, MAX_INDEX_KEY_LEN, compareKey, SL_ALLOW_DUP_KEY, getIndexKey);
   return cache;
+  
 }
 
 void indexCacheDestroy(IndexCache *cache) {
+  if (cache == NULL) { return; } 
+  tSkipListDestroy(cache->skiplist);
   free(cache);
 }
 
@@ -96,6 +106,7 @@ int indexCachePut(IndexCache *cache, int16_t fieldId, int16_t fieldType, const c
               uint32_t version, uint64_t uid, int8_t operType) {
   if (cache == NULL) { return -1;} 
 
+  // encode data
   int32_t total = sizeof(int32_t) + sizeof(fieldId) + sizeof(fieldType) + sizeof(fvLen) + fvLen  + sizeof(version) + sizeof(uid) + sizeof(operType); 
 
   char *buf = calloc(1, total); 
@@ -123,6 +134,10 @@ int indexCachePut(IndexCache *cache, int16_t fieldId, int16_t fieldType, const c
 
   memcpy(p, &operType, sizeof(operType));
   p += sizeof(operType); 
+
+  tSkipListPut(cache->skiplist, (void *)buf);  
+  // encode end
+ 
     
 }
 int indexCacheDel(IndexCache *cache, int32_t fieldId, const char *fieldValue, int32_t fvlen, uint64_t uid, int8_t operType) {