diff --git a/paddle/framework/backward_test.cc b/paddle/framework/backward_test.cc
index f100c4d05489ac3bd4ceb5f11ae871985f0e5d83..ad8003420dc14538d0dae9a1cb19d6459b154576 100644
--- a/paddle/framework/backward_test.cc
+++ b/paddle/framework/backward_test.cc
@@ -127,8 +127,8 @@ class FillZeroOpMaker : public OpProtoAndCheckerMaker {
  public:
   FillZeroOpMaker(OpProto *proto, OpAttrChecker *op_checker)
       : OpProtoAndCheckerMaker(proto, op_checker) {
-    AddInput("x", "x");
-    AddOutput("out", "out");
+    AddInput("Src", "x");
+    AddOutput("Dst", "out");
     AddComment("");
   }
 };
@@ -138,7 +138,7 @@ class AddOpMaker : public OpProtoAndCheckerMaker {
   AddOpMaker(OpProto *proto, OpAttrChecker *op_checker)
       : OpProtoAndCheckerMaker(proto, op_checker) {
     AddInput("X", "x").AsDuplicable();
-    AddOutput("Y", "y");
+    AddOutput("Out", "out");
     AddComment("");
   }
 };
diff --git a/paddle/framework/operator.cc b/paddle/framework/operator.cc
index 88a872deaadea6a20103ba9e3eaa7a8f099032d7..790cfc4746b1d34da413fa3c29a266f962c6dde6 100644
--- a/paddle/framework/operator.cc
+++ b/paddle/framework/operator.cc
@@ -151,16 +151,16 @@ std::vector<std::string> OperatorBase::OutputVars(bool has_intermediate) const {
 void OperatorBase::CheckAllInputOutputSet() const {
   auto& info_map = OpInfoMap::Instance();
   auto* op_info = info_map.GetNullable(Type());
-  if (op_info == nullptr) return;
+  if (op_info == nullptr || op_info->proto_ == nullptr) return;
 
   for (auto& in : op_info->Proto().inputs()) {
     PADDLE_ENFORCE(inputs_.find(in.name()) != inputs_.end(),
-                   "input %s is not set", in.name());
+                   "Type %s's input %s is not set", Type(), in.name());
   }
 
   for (auto& out : op_info->Proto().outputs()) {
     PADDLE_ENFORCE(outputs_.find(out.name()) != outputs_.end(),
-                   "output %s is not set", out.name());
+                   "Type %s's output %s is not set", Type(), out.name());
   }
 }