diff --git a/paddle/framework/grad_op_builder.cc b/paddle/framework/grad_op_builder.cc
index 0121d999613376615ac3bb6b30e4743c5b613d36..cbfc1bfab0cc24045dc51626530079f9c142e708 100644
--- a/paddle/framework/grad_op_builder.cc
+++ b/paddle/framework/grad_op_builder.cc
@@ -19,45 +19,46 @@ permissions and limitations under the License. */
 namespace paddle {
 namespace framework {
 
-class OpRegistry;
-
 using VarIndexMap = std::unordered_map<std::string, int>;
 
+typedef std::vector<int> Ints;
+
 enum class OpArgType { IN, OUT };
 
-static std::vector<int>* GetOpFormat(OperatorBase* op, const OpArgType& type) {
-  std::string key = type == OpArgType::IN ? "input_format" : "output_format";
-  return op->attrs_.count(key)
-             ? &boost::get<std::vector<int>>(op->attrs_.at(key))
-             : nullptr;
+const Ints* AttrFormat(const AttributeMap& attrs, const std::string& key) {
+  return (attrs.count(key) > 0) ? &boost::get<Ints>(attrs.at(key)) : nullptr;
 }
 
-static const std::vector<int>* GetOpFormat(const OperatorBase* op,
-                                           const OpArgType& type) {
-  std::string key = type == OpArgType::IN ? "input_format" : "output_format";
-  return op->attrs_.count(key)
-             ? &boost::get<std::vector<int>>(op->attrs_.at(key))
-             : nullptr;
+Ints* AttrFormat(AttributeMap& attrs, const std::string& key) {
+  return (attrs.count(key) > 0) ? &boost::get<Ints>(attrs.at(key)) : nullptr;
 }
 
-static void TransOpArg(const OperatorBase* src_op, OperatorBase* dst_op,
-                       const OpArgType& src_type, const OpArgType& dst_type,
+static void TransOpArg(const OperatorBase* src_op,
+                       std::vector<std::string>& grad_inputs,
+                       std::vector<std::string>& grad_outputs,
+                       AttributeMap& grad_attrs,
+                       std::unordered_map<std::string, int>& grad_idxs,
+                       const std::string& src_type, const std::string& dst_type,
                        int& idx, bool is_grad) {
   const std::vector<std::string>& src_inout =
-      src_type == OpArgType::IN ? src_op->inputs_ : src_op->outputs_;
-  const std::vector<int>* src_format = GetOpFormat(src_op, src_type);
+      (src_type == "input_format") ? src_op->inputs_ : src_op->outputs_;
+
+  const std::vector<int>* src_format = AttrFormat(src_op->Attrs(), src_type);
 
   std::vector<std::string>& dst_inout =
-      dst_type == OpArgType::IN ? dst_op->inputs_ : dst_op->outputs_;
-  std::vector<int>* dst_format = GetOpFormat(dst_op, dst_type);
+      (dst_type == "input_format") ? grad_inputs : grad_outputs;
+
+  std::vector<int>* dst_format = AttrFormat(grad_attrs, dst_type);
+
   const OpProto& proto = OpRegistry::protos().at(src_op->type_);
+
   const auto& src_arg_list =
-      src_type == OpArgType::IN ? proto.inputs() : proto.outputs();
+      (src_type == "input_format") ? proto.inputs() : proto.outputs();
 
   for (const auto& arg : src_arg_list) {
     std::string src_name = arg.name();
     std::string dst_name = is_grad ? src_name + kGradVarSuffix : src_name;
-    (*dst_op->in_out_idxs_)[dst_name] = idx++;
+    grad_idxs[dst_name] = idx++;
     int src_arg_idx = src_op->in_out_idxs_->at(src_name);
     int src_begin =
         src_format == nullptr ? src_arg_idx : src_format->at(src_arg_idx);
@@ -77,25 +78,35 @@ static void TransOpArg(const OperatorBase* src_op, OperatorBase* dst_op,
 
 OperatorBase* BuildGradOp(const OperatorBase* op) {
   const std::string& grad_op_type = OpRegistry::grad_ops().at(op->Type());
-  OperatorBase* grad_op = OpRegistry::op_creators().at(grad_op_type)();
-  grad_op->type_ = grad_op_type;
-  grad_op->attrs_ = op->attrs_;
-  grad_op->attrs_.erase("input_format");
-  grad_op->attrs_.erase("output_format");
-  if (GetOpFormat(op, OpArgType::IN) != nullptr) {
-    grad_op->attrs_["output_format"] = std::vector<int>({0});
+
+  AttributeMap grad_attrs(op->Attrs());
+  grad_attrs.erase("input_format");
+  grad_attrs.erase("output_format");
+  if (op->Attrs().count("input_format") > 0) {
+    grad_attrs["output_format"] = std::vector<int>({0});
   }
-  if (GetOpFormat(op, OpArgType::IN) != nullptr ||
-      GetOpFormat(op, OpArgType::OUT) != nullptr) {
-    grad_op->attrs_["input_format"] = std::vector<int>({0});
+  if (op->Attrs().count("input_format") > 0 ||
+      op->Attrs().count("output_format") > 0) {
+    grad_attrs["input_format"] = std::vector<int>({0});
   }
-  grad_op->in_out_idxs_.reset(new VarIndexMap());
+
+  std::vector<std::string> grad_inputs, grad_outputs;
+  std::unordered_map<std::string, int> grad_idxs;
   int in_idx = 0;
   int out_idx = 0;
-  TransOpArg(op, grad_op, OpArgType::IN, OpArgType::IN, in_idx, false);   // I
-  TransOpArg(op, grad_op, OpArgType::OUT, OpArgType::IN, in_idx, false);  // G
-  TransOpArg(op, grad_op, OpArgType::OUT, OpArgType::IN, in_idx, true);   // OG
-  TransOpArg(op, grad_op, OpArgType::IN, OpArgType::OUT, out_idx, true);  // IG
+  TransOpArg(op, grad_inputs, grad_outputs, grad_attrs, grad_idxs,
+             "input_format", "input_format", in_idx, false);  // I
+  TransOpArg(op, grad_inputs, grad_outputs, grad_attrs, grad_idxs,
+             "output_format", "input_format", in_idx, false);  // G
+  TransOpArg(op, grad_inputs, grad_outputs, grad_attrs, grad_idxs,
+             "output_format", "input_format", in_idx, true);  // OG
+  TransOpArg(op, grad_inputs, grad_outputs, grad_attrs, grad_idxs,
+             "input_format", "output_format", out_idx, true);  // IG
+
+  OperatorBase* grad_op = OpRegistry::op_creators().at(grad_op_type)();
+
+  // TODO(yi): Set data member of grad_op.
+
   return grad_op;
 }