diff --git a/app/templates/signup.html b/app/templates/signup.html
index 975c1fb..6ff0445 100644
--- a/app/templates/signup.html
+++ b/app/templates/signup.html
@@ -21,6 +21,27 @@
         slider.init(); // 初始化滑块解锁功能
     });
 
+      function containsDigitsLettersSpecialCharacters(s) {
+	  let resultD = 0, resultL = 0, resultS = 0;
+
+	  // Digit test
+          '0123456789'.split('').forEach((x) => {
+	      if (s.includes(x))
+		  resultD = 1;
+	  });
+
+	  // Letter test
+	  resultL =  /[a-z]/i.test(s);
+
+	  // Special charater test
+          '+-*/,.:;/\[]<>$%&()!?^~'.split('').forEach((x) => {
+	      if (s.includes(x))
+		  resultS = 1;
+	  });
+
+	  return resultD + resultL + resultS == 3;
+      }
+
     function signup(){
         // 发起 AJAX 请求来处理注册
         username = $("#username").val().trim();
@@ -44,6 +65,10 @@
             alert('密码过于简单。(密码长度至少4位)');
             return false;
         }
+        if (!containsDigitsLettersSpecialCharacters(password)) {
+            alert('密码过于简单。(密码要包括数字，字母，特殊符号)');
+            return false;
+        }
         is_ok = slider.getIsOk();
         if(!is_ok){
             alert('没有滑动验证');