diff --git a/paddlespeech/t2s/frontend/zh_normalization/constants.py b/paddlespeech/t2s/frontend/zh_normalization/constants.py
index 5d2b0b34e..6423ad74a 100644
--- a/paddlespeech/t2s/frontend/zh_normalization/constants.py
+++ b/paddlespeech/t2s/frontend/zh_normalization/constants.py
@@ -19,7 +19,7 @@ from pypinyin.constants import SUPPORT_UCS4
 # 全角半角转换
 # 英文字符全角 -> 半角映射表 (num: 52)
 F2H_ASCII_LETTERS = {
-    chr(ord(char) + 65248): char
+    ord(char) + 65248: ord(char)
     for char in string.ascii_letters
 }
 
@@ -27,12 +27,12 @@ F2H_ASCII_LETTERS = {
 H2F_ASCII_LETTERS = {value: key for key, value in F2H_ASCII_LETTERS.items()}
 
 # 数字字符全角 -> 半角映射表 (num: 10)
-F2H_DIGITS = {chr(ord(char) + 65248): char for char in string.digits}
+F2H_DIGITS = {ord(char) + 65248: ord(char) for char in string.digits}
 # 数字字符半角 -> 全角映射表
 H2F_DIGITS = {value: key for key, value in F2H_DIGITS.items()}
 
 # 标点符号全角 -> 半角映射表 (num: 32)
-F2H_PUNCTUATIONS = {chr(ord(char) + 65248): char for char in string.punctuation}
+F2H_PUNCTUATIONS = {ord(char) + 65248: ord(char) for char in string.punctuation}
 # 标点符号半角 -> 全角映射表
 H2F_PUNCTUATIONS = {value: key for key, value in F2H_PUNCTUATIONS.items()}