diff --git a/parser/common/parser_fp16_t.cc b/parser/common/parser_fp16_t.cc
index cf31644..f815249 100644
--- a/parser/common/parser_fp16_t.cc
+++ b/parser/common/parser_fp16_t.cc
@@ -1,5 +1,5 @@
 /**
- * Copyright 2020 Huawei Technologies Co., Ltd
+ * Copyright (c) Huawei Technologies Co., Ltd. 2020. 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.
diff --git a/parser/common/parser_fp16_t.h b/parser/common/parser_fp16_t.h
index 2d4c060..38787d9 100644
--- a/parser/common/parser_fp16_t.h
+++ b/parser/common/parser_fp16_t.h
@@ -131,10 +131,6 @@ constexpr uint16_t kFp16MaxValidExp = 0x001E;
 /// @ingroup fp16 basic parameter
 /// @brief   maximum mantissa value of fp16(11111 11111)
 constexpr uint16_t kFp16MaxMan = 0x03FF;
-/// @ingroup fp16 basic parameter
-/// @brief   absolute minimum normal value of fp16
-///          (E=1,M=0 D=2^(-14)=0.00006103515625)
-constexpr uint16_t kFp16MinNormal = 1.0f / (2 << 14);
 /// @ingroup fp16 basic operator
 /// @brief   get sign of fp16
 #define FP16_EXTRAC_SIGN(x) (((x) >> 15) & 1)
@@ -605,14 +601,14 @@ T GetManSum(int16_t e_a, const T &m_a, int16_t e_b, const T &m_b) {
   T sum = 0;
   if (e_a != e_b) {
     T m_tmp = 0;
-    int16_t e_tmp = std::abs(e_a - e_b);
+    int16_t e_tmp = staic_cast<int16_t>(std::abs(e_a - e_b));
     if (e_a > e_b) {
       m_tmp = m_b;
       m_tmp = RightShift(m_tmp, e_tmp);
       sum = m_a + m_tmp;
     } else {
       m_tmp = m_a;
-      m_tmp = RightShift(m_tmp, e_tmp);
+      m_tm= RightShift(m_tmp, e_tmp);
       sum = m_tmp + m_b;
     }
   } else {