diff --git a/paddle/function/CrossMapNormalOp.cpp b/paddle/function/CrossMapNormalOp.cpp
index 8749a48327604bd2460ed32035d0f6baac5c4e26..99af02ac7441460e6e2bf98cff4bd59ba6930185 100644
--- a/paddle/function/CrossMapNormalOp.cpp
+++ b/paddle/function/CrossMapNormalOp.cpp
@@ -173,13 +173,9 @@ public:
   }
 
   void calc(const BufferArgs& inputs, const BufferArgs& outputs) override {
-    CHECK_EQ((size_t)numInputs_, inputs.size());
-    CHECK_EQ((size_t)numOutputs_, outputs.size());
-
-    CHECK_EQ(inputs[0].shape().ndims(), (size_t)4);
-    CHECK(inputs[0].shape() == outputs[0].shape());
-    CHECK(inputs[0].shape() == outputs[1].shape());
-
+    check(inputs, outputs);
+    // ArgType check still on here,
+    // not sure whether it is better to put inside the check.
     CHECK_EQ(outputs[0].getArgType(), ASSIGN_TO);
     CHECK_EQ(outputs[1].getArgType(), ASSIGN_TO);
     size_t batchSize = inputs[0].shape()[0];
@@ -199,6 +195,15 @@ public:
                            pow_);
   }
 
+  void check(const BufferArgs& inputs, const BufferArgs& outputs) override {
+    CHECK_EQ((size_t)numInputs_, inputs.size());
+    CHECK_EQ((size_t)numOutputs_, outputs.size());
+
+    CHECK_EQ(inputs[0].shape().ndims(), (size_t)4);
+    CHECK(inputs[0].shape() == outputs[0].shape());
+    CHECK(inputs[0].shape() == outputs[1].shape());
+  }
+
   // Only need the shape of the input, can calculate the
   // floating-point operation.
   size_t ops(const BufferArgs& inputs, const BufferArgs& outputs) override {
@@ -211,6 +216,8 @@ public:
     // number of floating-point operations
     // an approximate value
     size_t ops = batchSize * maps * ((rows * columns) * size_);
+
+    return ops;
   }
 
 private:
diff --git a/paddle/function/Function.h b/paddle/function/Function.h
index 65688eebee975c0ba2ff72f5285c44af04b1dc3a..4802c2e846cfa2e1b51e96b6a4c612b5172c0708 100644
--- a/paddle/function/Function.h
+++ b/paddle/function/Function.h
@@ -153,6 +153,12 @@ public:
 
   virtual void calc(const BufferArgs& inputs, const BufferArgs& outputs) {}
 
+  // This member function is used to check whether the BufferType and shape of
+  // the inputs and outputs arguments of the Function are correct.
+  // General calc function which will call this check to do arguments check.
+  // Also before the call calc, the caller can also check their own arguments.
+  virtual void check(const BufferArgs& inputs, const BufferArgs& outputs) {}
+
   // Calculate the number of floating-point operations of this Function.
   // The inputs and outputs arguments do not need to contain the actual data,
   // only the shape.