diff --git a/cache/include/tango_cache_client.h b/cache/include/tango_cache_client.h
index 75c4e10..a0eda49 100644
--- a/cache/include/tango_cache_client.h
+++ b/cache/include/tango_cache_client.h
@@ -113,7 +113,7 @@ struct tango_cache_instance *tango_cache_instance_new(struct event_base* evbase,
 //future不可以为NULL
 int tango_cache_fetch_object(struct tango_cache_instance *instance, struct future* f, struct tango_cache_meta_get *meta);
 //从promise_success的result参数提取结果
-struct tango_cache_result *tango_cache_read_result(void *promise_result);
+struct tango_cache_result *tango_cache_read_result(future_result_t *promise_result);
 
 
 /* DELETE接口的API*/
diff --git a/cache/src/tango_cache_client.cpp b/cache/src/tango_cache_client.cpp
index 140b7e0..5a05e9a 100644
--- a/cache/src/tango_cache_client.cpp
+++ b/cache/src/tango_cache_client.cpp
@@ -109,7 +109,7 @@ void tango_cache_get_statistics(const struct tango_cache_instance *instance, str
 	out->memory_used  = instance->statistic.memory_used;
 }
 
-struct tango_cache_result *tango_cache_read_result(void *promise_result)
+struct tango_cache_result *tango_cache_read_result(future_result_t *promise_result)
 {
 	return (struct tango_cache_result *)promise_result;
 }
diff --git a/cache/src/tango_cache_client_in.h b/cache/src/tango_cache_client_in.h
index 879bd1e..9dfb97e 100644
--- a/cache/src/tango_cache_client_in.h
+++ b/cache/src/tango_cache_client_in.h
@@ -145,9 +145,9 @@ void tango_cache_ctx_destroy(struct tango_cache_ctx *ctx);
 void tango_cache_set_fail_state(struct tango_cache_ctx *ctx, enum CACHE_ERR_CODE error_code);
 const char *tango_cache_get_errstring(const struct tango_cache_ctx *ctx);
 
-struct tango_cache_ctx *tango_cache_update_prepare(struct tango_cache_instance *instance, struct future* future, struct tango_cache_meta_put *meta);
-struct tango_cache_ctx *tango_cache_fetch_prepare(struct tango_cache_instance *instance, struct future* future, struct tango_cache_meta_get *meta);
-struct tango_cache_ctx *tango_cache_delete_prepare(struct tango_cache_instance *instance, struct future* future, const char *objkey);
+struct tango_cache_ctx *tango_cache_update_prepare(struct tango_cache_instance *instance, struct future* f, struct tango_cache_meta_put *meta);
+struct tango_cache_ctx *tango_cache_fetch_prepare(struct tango_cache_instance *instance, struct future* f, struct tango_cache_meta_get *meta);
+struct tango_cache_ctx *tango_cache_delete_prepare(struct tango_cache_instance *instance, struct future* f, const char *objkey);
 
 #endif