diff --git a/paddlespeech/t2s/frontend/tone_sandhi.py b/paddlespeech/t2s/frontend/tone_sandhi.py
index 07f7fa2b..e3102b9b 100644
--- a/paddlespeech/t2s/frontend/tone_sandhi.py
+++ b/paddlespeech/t2s/frontend/tone_sandhi.py
@@ -63,7 +63,8 @@ class ToneSandhi():
             '扫把', '惦记'
         }
         self.must_not_neural_tone_words = {
-            "男子", "女子", "分子", "原子", "量子", "莲子", "石子", "瓜子", "电子", "人人", "虎虎"
+            "男子", "女子", "分子", "原子", "量子", "莲子", "石子", "瓜子", "电子", "人人", "虎虎",
+            "幺幺"
         }
         self.punc = "：，；。？！“”‘’':,;.?!"
 
diff --git a/paddlespeech/t2s/frontend/zh_normalization/num.py b/paddlespeech/t2s/frontend/zh_normalization/num.py
index a83b42a4..ec136773 100644
--- a/paddlespeech/t2s/frontend/zh_normalization/num.py
+++ b/paddlespeech/t2s/frontend/zh_normalization/num.py
@@ -103,7 +103,7 @@ def replace_default_num(match):
         str
     """
     number = match.group(0)
-    return verbalize_digit(number)
+    return verbalize_digit(number, alt_one=True)
 
 
 # 数字表达式