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diff --git a/compiler/locoex-customop/include/locoex/COpAttrTypes.h b/compiler/locoex-customop/include/locoex/COpAttrTypes.h
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+++ b/compiler/locoex-customop/include/locoex/COpAttrTypes.h
@@ -0,0 +1,101 @@
+/*
+ * Copyright (c) 2019 Samsung Electronics Co., Ltd. All Rights Reserved
+ *
+ * Licensed under the Apache License, Version 2.0 (the "License");
+ * you may not use this file except in compliance with the License.
+ * You may obtain a copy of the License at
+ *
+ *    http://www.apache.org/licenses/LICENSE-2.0
+ *
+ * Unless required by applicable law or agreed to in writing, software
+ * distributed under the License is distributed on an "AS IS" BASIS,
+ * WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
+ * See the License for the specific language governing permissions and
+ * limitations under the License.
+ */
+
+#ifndef __LOCOEX_COPATTRTYPES_H__
+#define __LOCOEX_COPATTRTYPES_H__
+
+#include <stdexcept>
+
+namespace locoex
+{
+
+/**
+ * @brief Tensorflow attribute type
+ *        Refer to https://www.tensorflow.org/guide/extend/op#attr_types
+ */
+enum class COpAttrType
+{
+  Int,
+  Float,
+  // TODO Support more attr types such as String, Bool, DataType, Tensor, Shape, List
+};
+
+/**
+ * @brief Struct that holds attr type
+ */
+struct COpAttrData
+{
+protected:
+  COpAttrData(COpAttrType attr_type) : _type(attr_type) {}
+
+public:
+  virtual ~COpAttrData() = default;
+
+public:
+  COpAttrType type() const { return _type; }
+  void type(COpAttrType attr_type) { _type = attr_type; }
+
+private:
+  COpAttrType _type;
+};
+
+/**
+ * @brief Struct that holds attr data of int type
+ */
+struct COpAttrInt final : public COpAttrData
+{
+public:
+  COpAttrInt(int tf_val) : COpAttrData(COpAttrType::Int) { _val = tf_val; }
+
+  int val() const { return _val; }
+  void val(int val) { _val = val; }
+
+private:
+  int _val;
+};
+
+/**
+ * @brief Struct that holds attr data of float type
+ */
+struct COpAttrFloat final : public COpAttrData
+{
+public:
+  COpAttrFloat(float tf_val) : COpAttrData(COpAttrType::Float) { _val = tf_val; }
+
+  float val() const { return _val; }
+  void val(float val) { _val = val; }
+
+private:
+  float _val;
+};
+
+template <COpAttrType AT> struct AttrTypeTrait;
+
+template <> struct AttrTypeTrait<COpAttrType::Float>
+{
+  using Type = COpAttrFloat;
+};
+
+template <> struct AttrTypeTrait<COpAttrType::Int>
+{
+  using Type = COpAttrInt;
+};
+
+// TODO support more attr types
+
+} // namespace locoex
+
+#endif // __LOCOEX_COPATTRTYPES_H__