diff --git a/readdata22_2.py b/readdata22_2.py
index 6f1e9d6..9905fd2 100644
--- a/readdata22_2.py
+++ b/readdata22_2.py
@@ -131,8 +131,9 @@ class DataSpeech():
 		else:
 			n = n_start // bili * (bili - 1)
 			yushu = n_start % bili
-			filename = self.dic_wavlist_stcmds[self.list_wavnum_stcmds[n + yushu - 1]]
-			list_symbol=self.dic_symbollist_stcmds[self.list_symbolnum_stcmds[n + yushu - 1]]
+			length=len(self.list_wavnum_stcmds)
+			filename = self.dic_wavlist_stcmds[self.list_wavnum_stcmds[(n + yushu - 1)%length]]
+			list_symbol=self.dic_symbollist_stcmds[self.list_symbolnum_stcmds[(n + yushu - 1)%length]]
 		
 		if('Windows' == plat.system()):
 			filename = filename.replace('/','\\') # windows系统下需要执行这一行，对文件路径做特别处理