diff --git a/source/libs/index/inc/index_fst_automation.h b/source/libs/index/inc/index_fst_automation.h
index 6deeb1878a4d2af53dc2b7e076a04264c9556b18..c2ab61bf5f490601c503dde46a49c7c2323dad39 100644
--- a/source/libs/index/inc/index_fst_automation.h
+++ b/source/libs/index/inc/index_fst_automation.h
@@ -38,8 +38,18 @@ typedef struct Complement {
 // automation 
 typedef struct AutomationCtx {
   AutomationType type; 
+  void *data;
 } AutomationCtx;
 
+
+
+typedef enum StartWithStateKind { Done, Running } StartWithStateKind; 
+
+typedef struct StartWithStateValue {
+  StartWithStateKind kind;
+  void *value;
+} StartWithStateValue;
+
 typedef struct AutomationFunc {
   void* (*start)(AutomationCtx *ctx) ; 
   bool (*isMatch)(AutomationCtx *ctx, void *);
diff --git a/source/libs/index/src/index_fst_automation.c b/source/libs/index/src/index_fst_automation.c
index 392d8e6e8d6bb0c86faab142fc8bddc294c65d9d..6a08b41b12ec08f534cd087b7546bc68d86d21c9 100644
--- a/source/libs/index/src/index_fst_automation.c
+++ b/source/libs/index/src/index_fst_automation.c
@@ -17,8 +17,9 @@
 
 
 // prefix query, impl later
-static void* prefixStart(AutomationCtx *ctx) {
-  return NULL;
+static void* prefixStart(AutomationCtx *ctx) {  
+  StartWithStateValue *data = (StartWithStateValue *)(ctx->data);
+  return data;
 };
 static bool prefixIsMatch(AutomationCtx *ctx, void *data) {
   return true;
@@ -82,16 +83,24 @@ AutomationCtx* automCtxCreate(void *data, AutomationType type) {
   AutomationCtx *ctx = calloc(1, sizeof(AutomationCtx));
   if (ctx == NULL) { return NULL; }
 
-  ctx->type = type;
-  if (ctx->type == AUTOMATION_PREFIX) {
-
-  } else if (ctx->type == AUTMMATION_MATCH) {
-
+  if (type == AUTOMATION_PREFIX) {
+    StartWithStateValue *swsv = (StartWithStateValue *)calloc(1, sizeof(StartWithStateValue));   
+    swsv->kind  = Done; 
+    swsv->value = NULL; 
+    ctx->data = (void *)swsv;
+  } else if (type == AUTMMATION_MATCH) {
+      
   } else {
     // add more search type
   }
+
+  ctx->type = type;
   return ctx; 
 } 
 void automCtxDestroy(AutomationCtx *ctx) {
+  if (ctx->type == AUTOMATION_PREFIX) {
+    free(ctx->data);
+  } else if (ctx->type == AUTMMATION_MATCH) {
+  }
   free(ctx);
 }