diff --git a/upload/install/index.php b/upload/install/index.php
index 2b575f4c52896ddc21e9b7fc5219193810b7f000..2995c00880a512e34e14222f152bbc9c32123af0 100644
--- a/upload/install/index.php
+++ b/upload/install/index.php
@@ -321,7 +321,8 @@ if($method == 'show_license') {
 			}
 		}
 
-		if(strpos($tablepre, '.') !== false || intval($tablepre[0])) {
+		// 表前缀格式限制最后一个字符为 _ , 避免形如 pre_1 的表前缀产生导致程序处理出错.
+		if(strpos($tablepre, '.') !== false || intval($tablepre[0]) || strrpos($tablepre, '_') !== strlen($tablepre)) {
 			show_msg('tablepre_invalid', $tablepre, 0);
 		}