diff --git a/accounts/templates/accounts/profile.html b/accounts/templates/accounts/profile.html
index 3d2e7ae..3239416 100644
--- a/accounts/templates/accounts/profile.html
+++ b/accounts/templates/accounts/profile.html
@@ -48,7 +48,7 @@
   <!-- 侧边栏 -->
   <div class="sidebar">
     <div class="user-id-sidebar">
-      <h3>你好，{{ username|default:"访客" }}</h3>
+      <h3>你好，<span id="sidebarUsername">{{ username|default:"访客" }}</span></h3>
     </div>
     <div class="navigation-links">
       <a href="{% url 'main:home' %}">返回主页</a>
@@ -58,6 +58,62 @@
   </div>
 
   <div class="main-content">
+    {% if subpage %}
+    <div class="profile-card">
+      <div class="profile-header">
+        <div class="profile-info">
+          <h2>{{ subpage_title }}</h2>
+        </div>
+      </div>
+      <div style="margin-bottom: 12px;">
+        <a href="{% url 'accounts:profile' %}" style="color:#2d8cf0; text-decoration:none;">返回个人中心</a>
+      </div>
+      {% if subpage == "username" %}
+      <form id="nameForm">
+        <div class="form-group">
+          <label for="newUsername">新用户名</label>
+          <input type="text" id="newUsername" placeholder="请输入新用户名" required>
+        </div>
+        <button type="submit" class="btn">保存</button>
+        <div id="nameMsg" class="msg"></div>
+      </form>
+      {% endif %}
+      {% if subpage == "password" %}
+      {% if permission_name != "管理员" and not profile_user.manage_key %}
+      <form id="pwdForm">
+        <div class="form-group">
+          <label for="newPassword">新密码</label>
+          <input type="password" id="newPassword" autocomplete="new-password" required>
+        </div>
+        <div class="form-group">
+          <label for="confirmPassword">确认密码</label>
+          <input type="password" id="confirmPassword" autocomplete="new-password" required>
+        </div>
+        <button type="submit" class="btn">保存</button>
+        <div id="pwdMsg" class="msg"></div>
+      </form>
+      {% else %}
+      <div class="msg error">无权限</div>
+      {% endif %}
+      {% endif %}
+      {% if subpage == "registration-code" %}
+      <form id="rcForm">
+        <div class="form-group">
+          <label for="newRegCode">新注册码</label>
+          <input type="text" id="newRegCode" placeholder="输入新注册码后替换原有 key" required>
+        </div>
+        <div class="form-group">
+          <label>预览</label>
+          <div id="rcPreview" style="background:#f8fafc; border:1px solid #e5e7eb; border-radius:10px; padding:10px 12px; font-size:13px; color:#334155;">
+            <div style="color:#64748b;">输入注册码后自动显示 key 预览</div>
+          </div>
+        </div>
+        <button type="submit" class="btn">替换</button>
+        <div id="rcMsg" class="msg"></div>
+      </form>
+      {% endif %}
+    </div>
+    {% else %}
     <div class="profile-card">
       <div class="profile-header">
         <div class="profile-info">
@@ -65,7 +121,7 @@
         </div>
       </div>
       <div class="profile-details">
-        <p><span class="label">用户名:</span> {{ profile_user.username }}</p>
+        <p><span class="label">用户名:</span> <span id="profileUsername">{{ profile_user.username }}</span></p>
         <p><span class="label">用户ID:</span> {{ profile_user.user_id }}</p>
         <p><span class="label">注册码:</span> {{ profile_user.registration_code|default:"无" }}</p>
         <p><span class="label">所属:</span> {{ profile_user.key|join:"、"|default:"未填写" }}</p>
@@ -74,6 +130,21 @@
       </div>
     </div>
 
+    <div class="profile-card">
+      <div class="profile-header">
+        <div class="profile-info">
+          <h2>账号设置</h2>
+        </div>
+      </div>
+      <div style="display:flex; gap:12px; flex-wrap:wrap;">
+        <a class="btn" href="{% url 'accounts:profile_username' %}">修改用户名</a>
+        {% if permission_name != "管理员" and not profile_user.manage_key %}
+        <a class="btn" href="{% url 'accounts:profile_password' %}">修改密码</a>
+        {% endif %}
+        <a class="btn" href="{% url 'accounts:profile_registration_code' %}">替换注册码</a>
+      </div>
+    </div>
+
     <div class="section-title">我的提交</div>
     {% if achievements %}
       <div class="image-grid">
@@ -96,49 +167,6 @@
         <a href="{% url 'elastic:upload_page' %}" style="color: #2d8cf0; text-decoration: none;">去上传第一张图片吧！</a>
       </div>
     {% endif %}
-
-    <div class="profile-card rc-card">
-      <div class="profile-header">
-        <div class="profile-info">
-          <h2>替换注册码</h2>
-        </div>
-      </div>
-      <form id="rcForm">
-        <div class="form-group">
-          <label for="newRegCode">新注册码</label>
-          <input type="text" id="newRegCode" placeholder="输入新注册码后替换原有 key" required>
-        </div>
-        <div class="form-group">
-          <label>预览</label>
-          <div id="rcPreview" style="background:#f8fafc; border:1px solid #e5e7eb; border-radius:10px; padding:10px 12px; font-size:13px; color:#334155;">
-            <div style="color:#64748b;">输入注册码后自动显示 key 预览</div>
-          </div>
-        </div>
-        <button type="submit" class="btn">替换</button>
-        <div id="rcMsg" class="msg"></div>
-      </form>
-    </div>
-
-    {% if permission_name != "管理员" and not profile_user.manage_key %}
-    <div class="profile-card">
-      <div class="profile-header">
-        <div class="profile-info">
-          <h2>修改密码</h2>
-        </div>
-      </div>
-      <form id="pwdForm">
-        <div class="form-group">
-          <label for="newPassword">新密码</label>
-          <input type="password" id="newPassword" autocomplete="new-password" required>
-        </div>
-        <div class="form-group">
-          <label for="confirmPassword">确认密码</label>
-          <input type="password" id="confirmPassword" autocomplete="new-password" required>
-        </div>
-        <button type="submit" class="btn">保存</button>
-        <div id="pwdMsg" class="msg"></div>
-      </form>
-    </div>
     {% endif %}
   </div>
 
@@ -230,6 +258,62 @@
       });
     }
 
+    const nameForm = document.getElementById('nameForm');
+    if (nameForm) {
+      nameForm.addEventListener('submit', async (e) => {
+        e.preventDefault();
+        const msg = document.getElementById('nameMsg');
+        msg.textContent = '';
+        msg.className = 'msg';
+        const input = document.getElementById('newUsername');
+        const newName = (input.value || '').trim();
+        const currentNameEl = document.getElementById('profileUsername');
+        const currentName = (currentNameEl && currentNameEl.textContent ? currentNameEl.textContent : '').trim();
+        if (!newName) {
+          msg.textContent = '请输入用户名';
+          msg.className = 'msg error';
+          return;
+        }
+        if (newName.length > 50) {
+          msg.textContent = '用户名过长';
+          msg.className = 'msg error';
+          return;
+        }
+        if (currentName && newName === currentName) {
+          msg.textContent = '用户名未变化';
+          msg.className = 'msg error';
+          return;
+        }
+        try {
+          const csrftoken = getCookie('csrftoken');
+          const resp = await fetch('/accounts/profile/username/update/', {
+            method: 'POST',
+            credentials: 'same-origin',
+            headers: {
+              'Content-Type': 'application/json',
+              'X-CSRFToken': csrftoken || ''
+            },
+            body: JSON.stringify({ username: newName })
+          });
+          const data = await resp.json();
+          if (resp.ok && data.ok) {
+            msg.textContent = '修改成功';
+            msg.className = 'msg success';
+            if (currentNameEl) currentNameEl.textContent = data.username || newName;
+            const sidebarName = document.getElementById('sidebarUsername');
+            if (sidebarName) sidebarName.textContent = data.username || newName;
+            input.value = '';
+          } else {
+            msg.textContent = (data && data.message) ? data.message : '操作失败';
+            msg.className = 'msg error';
+          }
+        } catch (err) {
+          msg.textContent = '操作失败';
+          msg.className = 'msg error';
+        }
+      });
+    }
+
     const rcForm = document.getElementById('rcForm');
     if (rcForm) {
       let rcPreviewTimer = null;
diff --git a/accounts/urls.py b/accounts/urls.py
index 4eb62ed..3668ca4 100644
--- a/accounts/urls.py
+++ b/accounts/urls.py
@@ -13,6 +13,10 @@ urlpatterns = [
     path("register/submit/", views.register_submit, name="register_submit"),
     path("email/send-code/", views.send_email_code, name="send_email_code"),
     path("profile/", views.profile_page, name="profile"),
+    path("profile/username/", views.profile_username_page, name="profile_username"),
+    path("profile/password/", views.profile_password_page, name="profile_password"),
+    path("profile/registration-code/", views.profile_registration_code_page, name="profile_registration_code"),
+    path("profile/username/update/", views.update_profile_username_view, name="update_profile_username"),
     path("profile/registration-code/replace/", views.replace_registration_code_view, name="replace_registration_code"),
     path("profile/registration-code/preview/", views.registration_code_preview_view, name="registration_code_preview"),
     path("registration-code/request/submit/", views.submit_registration_code_request_view, name="submit_registration_code_request"),
diff --git a/accounts/views.py b/accounts/views.py
index b22b0ef..399700d 100644
--- a/accounts/views.py
+++ b/accounts/views.py
@@ -71,33 +71,62 @@ def set_session_key(request):
     request.session["session_enc_key_b64"] = base64.b64encode(key_bytes).decode("ascii")
     return JsonResponse({"ok": True})
 
-@require_http_methods(["GET"])
-@ensure_csrf_cookie
-def profile_page(request):
+def _build_profile_context(request):
     session_user_id = request.session.get("user_id")
     if session_user_id is None:
-        return redirect("/accounts/login/")
-    
-    # 获取用户信息
+        return None
     user = get_user_by_id(session_user_id)
     if not user:
-        return redirect("/accounts/login/")
-    
-    # 获取个人提交的成就（图片）
+        return None
     from elastic.es_connect import search_all
     from elastic.views import _attach_image_urls
-    
     raw_results = [r for r in search_all() if str(r.get("writer_id", "")) == str(session_user_id)]
     achievements = _attach_image_urls(request, raw_results)
-    
     permission_name = "管理员" if int(user.get("permission", 1)) == 0 else "普通用户"
-    
-    context = {
+    return {
         "username": request.session.get("username"),
         "profile_user": user,
         "permission_name": permission_name,
         "achievements": achievements,
     }
+
+@require_http_methods(["GET"])
+@ensure_csrf_cookie
+def profile_page(request):
+    context = _build_profile_context(request)
+    if context is None:
+        return redirect("/accounts/login/")
+    context["subpage"] = ""
+    return render(request, "accounts/profile.html", context)
+
+@require_http_methods(["GET"])
+@ensure_csrf_cookie
+def profile_username_page(request):
+    context = _build_profile_context(request)
+    if context is None:
+        return redirect("/accounts/login/")
+    context["subpage"] = "username"
+    context["subpage_title"] = "修改用户名"
+    return render(request, "accounts/profile.html", context)
+
+@require_http_methods(["GET"])
+@ensure_csrf_cookie
+def profile_password_page(request):
+    context = _build_profile_context(request)
+    if context is None:
+        return redirect("/accounts/login/")
+    context["subpage"] = "password"
+    context["subpage_title"] = "修改密码"
+    return render(request, "accounts/profile.html", context)
+
+@require_http_methods(["GET"])
+@ensure_csrf_cookie
+def profile_registration_code_page(request):
+    context = _build_profile_context(request)
+    if context is None:
+        return redirect("/accounts/login/")
+    context["subpage"] = "registration-code"
+    context["subpage_title"] = "替换注册码"
     return render(request, "accounts/profile.html", context)
 
 @require_http_methods(["POST"])
@@ -304,6 +333,34 @@ def replace_registration_code_view(request):
         return JsonResponse({"ok": False, "message": "替换失败"}, status=500)
     return JsonResponse({"ok": True})
 
+@require_http_methods(["POST"])
+@csrf_protect
+def update_profile_username_view(request):
+    session_user_id = request.session.get("user_id")
+    if session_user_id is None:
+        return JsonResponse({"ok": False, "message": "未登录"}, status=401)
+    try:
+        payload = json.loads(request.body.decode("utf-8"))
+    except json.JSONDecodeError:
+        return JsonResponse({"ok": False, "message": "JSON无效"}, status=400)
+    new_username = (payload.get("username") or "").strip()
+    if not new_username:
+        return JsonResponse({"ok": False, "message": "请输入用户名"}, status=400)
+    if len(new_username) > 50:
+        return JsonResponse({"ok": False, "message": "用户名过长"}, status=400)
+    me = get_user_by_id(session_user_id) or {}
+    if str(me.get("username", "")).strip() == new_username:
+        request.session["username"] = new_username
+        return JsonResponse({"ok": True, "username": new_username})
+    existing = es_get_user_by_username(new_username)
+    if existing and str(existing.get("user_id")) != str(session_user_id):
+        return JsonResponse({"ok": False, "message": "用户名已存在"}, status=409)
+    ok = update_user_by_id(session_user_id, username=new_username)
+    if not ok:
+        return JsonResponse({"ok": False, "message": "修改失败"}, status=500)
+    request.session["username"] = new_username
+    return JsonResponse({"ok": True, "username": new_username})
+
 @require_http_methods(["GET"])
 def registration_code_preview_view(request):
     session_user_id = request.session.get("user_id")