diff --git a/web/template/syzoj/problem.php b/web/template/syzoj/problem.php
index dd1a2bd..8737c3f 100644
--- a/web/template/syzoj/problem.php
+++ b/web/template/syzoj/problem.php
@@ -131,12 +131,21 @@ if ($pr_flag) {
       // 删除代码块里的html字符防止引起混乱
       $s = preg_replace_callback('/(```.*?```|`[^`]*`)/s', function ($matches) {
         $ss = str_replace('<br />', '', $matches[0]);
-        // 大于小于号
-        $ss = htmlspecialchars_decode($ss, ENT_QUOTES | ENT_HTML5);
         return $ss;
       }, $s);
       // 特殊转义
       $s = str_replace("<br />", "\n", $s);
+      // 把<pre></pre>中间的html字符转成原始字符
+      $s = preg_replace_callback('/<pre>(.*?)<\/pre>/s', function ($matches) {
+        $content = $matches[1];
+        $content = htmlspecialchars_decode($content, ENT_QUOTES);
+        $content = str_replace("&lt;", "<", $content);
+        $content = str_replace("&gt;", ">", $content);
+        $content = str_replace("&amp;", "&", $content);
+        $content = str_replace("&quot;", "\"", $content);
+        $content = str_replace("&#039;", "'", $content);
+        return "<pre>" . $content . "</pre>";
+      }, $s);
       return $s;
     }
     ?>