diff --git a/accounts/templates/accounts/register.html b/accounts/templates/accounts/register.html
index 263d2e8..bb12c1a 100644
--- a/accounts/templates/accounts/register.html
+++ b/accounts/templates/accounts/register.html
@@ -20,8 +20,8 @@
     <h1>注册新用户</h1>
     <form id="regForm">
       {% csrf_token %}
-      <label for="code">注册码</label>
-      <input id="code" name="code" type="text" required />
+      <label for="code">注册码（选填）</label>
+      <input id="code" name="code" type="text" />
       <label for="email">邮箱</label>
       <input id="email" name="email" type="email" required />
       <button id="sendCodeBtn" type="button">发送验证码</button>
@@ -37,7 +37,7 @@
       <button id="regBtn" type="submit">注册</button>
       <div id="error" class="error"></div>
     </form>
-    <div class="hint">仅允许持有管理员提供注册码的学生注册</div>
+    <div class="hint">有注册码请填写，否则可留空</div>
   </div>
   <script>
     function getCookie(name){const v=`; ${document.cookie}`;const p=v.split(`; ${name}=`);if(p.length===2) return p.pop().split(';').shift();}
@@ -50,7 +50,7 @@
       const email_code=(document.getElementById('email_code').value||'').trim();
       const password=document.getElementById('password').value||'';
       const confirm=document.getElementById('confirm').value||'';
-      if(!code||!email||!email_code||!username||!password){err.textContent='请填写所有字段';return;}
+      if(!email||!email_code||!username||!password){err.textContent='请填写所有必填字段';return;}
       if(password!==confirm){err.textContent='两次密码不一致';return;}
       const btn=document.getElementById('regBtn'); btn.disabled=true;
       try{
diff --git a/accounts/views.py b/accounts/views.py
index ce2f0ff..ee6baa9 100644
--- a/accounts/views.py
+++ b/accounts/views.py
@@ -188,7 +188,7 @@ def register_submit(request):
     email_code = (payload.get("email_code") or "").strip()
     username = (payload.get("username") or "").strip()
     password = (payload.get("password") or "")
-    if not code or not email or not email_code or not username or not password:
+    if not email or not email_code or not username or not password:
         return HttpResponseBadRequest("Missing fields")
     v = request.session.get("email_verify") or {}
     if (v.get("email") or "") != email:
@@ -201,20 +201,22 @@ def register_submit(request):
         return JsonResponse({"ok": False, "message": "验证码已过期"}, status=400)
     if (v.get("code") or "") != email_code:
         return JsonResponse({"ok": False, "message": "邮箱验证码错误"}, status=400)
-    rc = get_registration_code(code)
-    if not rc:
-        return JsonResponse({"ok": False, "message": "注册码无效"}, status=400)
-    try:
-        exp = rc.get("expires_at")
-        now = __import__("datetime").datetime.now(__import__("datetime").timezone.utc)
-        if hasattr(exp, 'isoformat'):
-            exp_dt = exp
-        else:
-            exp_dt = __import__("datetime").datetime.fromisoformat(str(exp))
-        if exp_dt <= now:
-            return JsonResponse({"ok": False, "message": "注册码已过期"}, status=400)
-    except Exception:
-        pass
+    rc = None
+    if code:
+        rc = get_registration_code(code)
+        if not rc:
+            return JsonResponse({"ok": False, "message": "注册码无效"}, status=400)
+        try:
+            exp = rc.get("expires_at")
+            now = __import__("datetime").datetime.now(__import__("datetime").timezone.utc)
+            if hasattr(exp, 'isoformat'):
+                exp_dt = exp
+            else:
+                exp_dt = __import__("datetime").datetime.fromisoformat(str(exp))
+            if exp_dt <= now:
+                return JsonResponse({"ok": False, "message": "注册码已过期"}, status=400)
+        except Exception:
+            pass
     existing = es_get_user_by_username(username)
     if existing:
         return JsonResponse({"ok": False, "message": "用户名已存在"}, status=409)
@@ -226,8 +228,8 @@ def register_submit(request):
         "password": password,
         "permission": 1,
         "email": email,
-        "key": rc.get("keys") or [],
-        "manage_key": rc.get("manage_keys") or [],
+        "key": (rc.get("keys") if rc else []) or [],
+        "manage_key": (rc.get("manage_keys") if rc else []) or [],
     })
     if not ok:
         return JsonResponse({"ok": False, "message": "注册失败"}, status=500)
diff --git a/elastic/documents.py b/elastic/documents.py
index cf8eba1..b8c662e 100644
--- a/elastic/documents.py
+++ b/elastic/documents.py
@@ -60,6 +60,7 @@ class RegistrationCodeDocument(Document):
     code = fields.KeywordField() #具体值
     keys = fields.KeywordField(multi=True) #对应的key
     manage_keys = fields.KeywordField(multi=True) #对应的manage_key
+    created_at = fields.DateField() #创建时间
     expires_at = fields.DateField() #过期时间
     created_by = fields.LongField() #创建者id
     class Django: