diff --git a/sdk/sdk.go b/sdk/sdk.go
index 32d10727800b381a78167e6de624405f3143ad2f..59d49b1e356c307149176515f3f2ef74c8ecc13c 100644
--- a/sdk/sdk.go
+++ b/sdk/sdk.go
@@ -719,7 +719,7 @@ func (s *SDK) newIterator(iteratorFuncName, startKey string, startField string,
 	}
 
 	// reset writeMap
-	s.writeMap = make(map[string][]byte, MapSize)
+	//s.writeMap = make(map[string][]byte, MapSize)
 
 	createKvIteratorReq := &protogo.DockerVMMessage{
 		ChainId:      s.chainId,
@@ -774,7 +774,7 @@ func (s *SDK) NewHistoryKvIterForKey(key, field string) (KeyHistoryKvIter, error
 	}
 
 	// reset writeMap
-	s.writeMap = make(map[string][]byte, MapSize)
+	//s.writeMap = make(map[string][]byte, MapSize)
 
 	createKeyHistoryKvIterReq := &protogo.DockerVMMessage{
 		ChainId:      s.chainId,
diff --git a/sdk/sdk_interface.go b/sdk/sdk_interface.go
index 8a13d93c762c941b557114e5b6c06bf1ab54ca29..9e1c0a6f844f254fc75ac63cb88715ba9a1a57dc 100644
--- a/sdk/sdk_interface.go
+++ b/sdk/sdk_interface.go
@@ -34,7 +34,7 @@ type SDKInterface interface {
 	// @param field: 获取的参数名
 	// @return1: 获取结果，格式为string
 	// @return2: 获取错误信息
-	// Deprecated
+	// Deprecated: 无法通过返回值来判断state是否存在，建议使用GetStateWithExists
 	GetState(key, field string) (string, error)
 	// GetStateWithExists get [key, field] from chain
 	// @param key: 获取的参数名
@@ -58,7 +58,7 @@ type SDKInterface interface {
 	// @param key: 获取的参数名
 	// @return1: 获取结果，格式为string
 	// @return2: 获取错误信息
-	// Deprecated
+	// Deprecated: 无法通过返回值来判断state是否存在，建议使用GetStateFromKeyWithExists
 	GetStateFromKey(key string) (string, error)
 	// GetStateFromKeyWithExists get [key] from chain
 	// @param key: 获取的参数名