diff --git a/admin.py b/admin.py
index 150223d..f7a6ef8 100644
--- a/admin.py
+++ b/admin.py
@@ -313,35 +313,56 @@ def clear_cache():
 @admin_required
 def settings():
     """系统配置"""
-    if request.method == 'POST':
-        data = request.json if request.is_json else request.form
-        
-        for key, value in data.items():
-            SystemConfig.set(key, value)
-        
-        if request.is_json:
-            return jsonify({'success': True})
-        flash('配置已保存', 'success')
-    
-    # 获取所有配置
-    configs = SystemConfig.query.all()
-    config_dict = {c.key: c.value for c in configs}
-    
-    # 获取动态配置
-    dynamic_configs = DynamicConfig.query.all()
-    
     # 获取LLM动态配置
     llm_config = get_llm_config()
     
+    # 获取网站基础配置
+    site_config = {
+        'site_name': DynamicConfig.get('site_name', 'PDF翻译助手'),
+        'site_footer': DynamicConfig.get('site_footer', '© 2026 PDF翻译助手'),
+        'max_file_size': DynamicConfig.get('max_file_size', 50),
+        'cache_expire_days': DynamicConfig.get('cache_expire_days', 30),
+        'enable_email_notify': DynamicConfig.get('enable_email_notify', True),
+        'enable_cache': DynamicConfig.get('enable_cache', True),
+        'enable_guest': DynamicConfig.get('enable_guest', True),
+        'default_source_lang': DynamicConfig.get('default_source_lang', 'en'),
+        'default_target_lang': DynamicConfig.get('default_target_lang', 'zh'),
+    }
+    
     return render_template('admin/settings.html',
-        configs=config_dict,
-        dynamic_configs=dynamic_configs,
-        user_limits=USER_LIMITS,
-        membership_plans=MEMBERSHIP_PLANS,
-        llm_config=llm_config
+        llm_config=llm_config,
+        site_config=site_config
     )
 
 
+@admin_bp.route('/settings/site', methods=['POST'])
+@admin_required
+def save_site_settings():
+    """保存网站基础配置"""
+    data = request.json
+    
+    # 保存每个配置项
+    for key, value in data.items():
+        if key in ['max_file_size', 'cache_expire_days']:
+            DynamicConfig.set(f'site_{key}', int(value), category='site', value_type='int', user_id=session.get('user_id'))
+        elif key in ['enable_email_notify', 'enable_cache', 'enable_guest']:
+            DynamicConfig.set(f'site_{key}', bool(value), category='site', value_type='bool', user_id=session.get('user_id'))
+        else:
+            DynamicConfig.set(f'site_{key}', value, category='site', user_id=session.get('user_id'))
+    
+    # 记录日志
+    log = OperationLog(
+        user_id=session.get('user_id'),
+        username='admin',
+        action='save_site_settings',
+        detail='保存网站基础配置'
+    )
+    db.session.add(log)
+    db.session.commit()
+    
+    return jsonify({'success': True})
+
+
 # ==================== 用户权限配置 ====================
 @admin_bp.route('/settings/user-limits', methods=['GET', 'POST'])
 @admin_required
@@ -1450,4 +1471,20 @@ def init_default_backup_llm():
 def get_backup_llm_configs():
     """获取所有备用大模型配置（供其他模块使用）"""
     configs = BackupLLMConfig.query.filter_by(is_active=True).order_by(BackupLLMConfig.sort_order).all()
-    return [c.to_dict() for c in configs]
\ No newline at end of file
+    return [c.to_dict() for c in configs]
+
+
+# ==================== 获取网站基础配置（供其他模块使用） ====================
+def get_site_config():
+    """获取网站基础配置"""
+    return {
+        'site_name': DynamicConfig.get('site_name', 'PDF翻译助手'),
+        'site_footer': DynamicConfig.get('site_footer', '© 2026 PDF翻译助手'),
+        'max_file_size': DynamicConfig.get('max_file_size', 50),
+        'cache_expire_days': DynamicConfig.get('cache_expire_days', 30),
+        'enable_email_notify': DynamicConfig.get('enable_email_notify', True),
+        'enable_cache': DynamicConfig.get('enable_cache', True),
+        'enable_guest': DynamicConfig.get('enable_guest', True),
+        'default_source_lang': DynamicConfig.get('default_source_lang', 'en'),
+        'default_target_lang': DynamicConfig.get('default_target_lang', 'zh'),
+    }
\ No newline at end of file
diff --git a/templates/admin/settings.html b/templates/admin/settings.html
index bcd774a..25e1f58 100644
--- a/templates/admin/settings.html
+++ b/templates/admin/settings.html
@@ -22,16 +22,16 @@
             <h5 class="text-white mb-0"><i class="bi bi-gear-fill"></i> 后台管理</h5>
         </div>
         <ul class="nav flex-column">
-            <li class="nav-item"><a class="nav-link " href="{{ url_for('admin.dashboard') }}"><i class="bi bi-speedometer2"></i> 数据概览</a></li>
-            <li class="nav-item"><a class="nav-link " href="{{ url_for('admin.users') }}"><i class="bi bi-people"></i> 用户管理</a></li>
-            <li class="nav-item"><a class="nav-link " href="{{ url_for('admin.translations') }}"><i class="bi bi-file-text"></i> 翻译记录</a></li>
-            <li class="nav-item"><a class="nav-link " href="{{ url_for('admin.cache_list') }}"><i class="bi bi-database"></i> 缓存管理</a></li>
-            <li class="nav-item"><a class="nav-link " href="{{ url_for('admin.packages') }}"><i class="bi bi-box-seam"></i> 数据包套餐</a></li>
-            <li class="nav-item"><a class="nav-link " href="{{ url_for('admin.stats') }}"><i class="bi bi-bar-chart"></i> 统计报表</a></li>
-            <li class="nav-item"><a class="nav-link " href="{{ url_for('admin.logs') }}"><i class="bi bi-list-check"></i> 操作日志</a></li>
-            <li class="nav-item"><a class="nav-link " href="{{ url_for('admin.llm_config') }}"><i class="bi bi-cpu"></i> 大模型配置</a></li>
-            <li class="nav-item"><a class="nav-link " href="{{ url_for('admin.user_types') }}"><i class="bi bi-person-badge"></i> 用户类型</a></li>
-            <li class="nav-item"><a class="nav-link " href="{{ url_for('admin.membership_plans') }}"><i class="bi bi-credit-card"></i> 会员套餐</a></li>
+            <li class="nav-item"><a class="nav-link" href="{{ url_for('admin.dashboard') }}"><i class="bi bi-speedometer2"></i> 数据概览</a></li>
+            <li class="nav-item"><a class="nav-link" href="{{ url_for('admin.users') }}"><i class="bi bi-people"></i> 用户管理</a></li>
+            <li class="nav-item"><a class="nav-link" href="{{ url_for('admin.translations') }}"><i class="bi bi-file-text"></i> 翻译记录</a></li>
+            <li class="nav-item"><a class="nav-link" href="{{ url_for('admin.cache_list') }}"><i class="bi bi-database"></i> 缓存管理</a></li>
+            <li class="nav-item"><a class="nav-link" href="{{ url_for('admin.packages') }}"><i class="bi bi-box-seam"></i> 数据包套餐</a></li>
+            <li class="nav-item"><a class="nav-link" href="{{ url_for('admin.stats') }}"><i class="bi bi-bar-chart"></i> 统计报表</a></li>
+            <li class="nav-item"><a class="nav-link" href="{{ url_for('admin.logs') }}"><i class="bi bi-list-check"></i> 操作日志</a></li>
+            <li class="nav-item"><a class="nav-link" href="{{ url_for('admin.llm_config') }}"><i class="bi bi-cpu"></i> 大模型配置</a></li>
+            <li class="nav-item"><a class="nav-link" href="{{ url_for('admin.user_types') }}"><i class="bi bi-person-badge"></i> 用户类型</a></li>
+            <li class="nav-item"><a class="nav-link" href="{{ url_for('admin.membership_plans') }}"><i class="bi bi-credit-card"></i> 会员套餐</a></li>
             <li class="nav-item"><a class="nav-link active" href="{{ url_for('admin.settings') }}"><i class="bi bi-sliders"></i> 系统配置</a></li>
         </ul>
         <div class="position-absolute bottom-0 w-100 p-3 border-top border-secondary">
@@ -42,6 +42,92 @@
     <main class="main-content">
         <h4 class="mb-4"><i class="bi bi-sliders"></i> 系统配置</h4>
         
+        <!-- 网站基础配置 -->
+        <div class="card mb-4">
+            <div class="card-header">
+                <h6 class="mb-0"><i class="bi bi-building"></i> 网站基础配置</h6>
+            </div>
+            <div class="card-body">
+                <form id="siteConfigForm">
+                    <div class="row">
+                        <div class="col-md-6">
+                            <div class="mb-3">
+                                <label class="form-label">网站名称</label>
+                                <input type="text" class="form-control" name="site_name" value="{{ site_config.site_name }}" placeholder="PDF翻译助手">
+                                <small class="text-muted">显示在页面标题和Logo处</small>
+                            </div>
+                            <div class="mb-3">
+                                <label class="form-label">底部信息</label>
+                                <textarea class="form-control" name="site_footer" rows="2" placeholder="© 2026 PDF翻译助手">{{ site_config.site_footer }}</textarea>
+                                <small class="text-muted">显示在页面底部，支持HTML</small>
+                            </div>
+                            <div class="mb-3">
+                                <label class="form-label">默认源语言</label>
+                                <select class="form-select" name="default_source_lang">
+                                    <option value="en" {% if site_config.default_source_lang == 'en' %}selected{% endif %}>英语 (en)</option>
+                                    <option value="ja" {% if site_config.default_source_lang == 'ja' %}selected{% endif %}>日语 (ja)</option>
+                                    <option value="ko" {% if site_config.default_source_lang == 'ko' %}selected{% endif %}>韩语 (ko)</option>
+                                    <option value="fr" {% if site_config.default_source_lang == 'fr' %}selected{% endif %}>法语 (fr)</option>
+                                    <option value="de" {% if site_config.default_source_lang == 'de' %}selected{% endif %}>德语 (de)</option>
+                                    <option value="es" {% if site_config.default_source_lang == 'es' %}selected{% endif %}>西班牙语 (es)</option>
+                                    <option value="ru" {% if site_config.default_source_lang == 'ru' %}selected{% endif %}>俄语 (ru)</option>
+                                    <option value="pt" {% if site_config.default_source_lang == 'pt' %}selected{% endif %}>葡萄牙语 (pt)</option>
+                                    <option value="zh" {% if site_config.default_source_lang == 'zh' %}selected{% endif %}>中文 (zh)</option>
+                                </select>
+                            </div>
+                            <div class="mb-3">
+                                <label class="form-label">默认目标语言</label>
+                                <select class="form-select" name="default_target_lang">
+                                    <option value="zh" {% if site_config.default_target_lang == 'zh' %}selected{% endif %}>中文 (zh)</option>
+                                    <option value="en" {% if site_config.default_target_lang == 'en' %}selected{% endif %}>英语 (en)</option>
+                                    <option value="ja" {% if site_config.default_target_lang == 'ja' %}selected{% endif %}>日语 (ja)</option>
+                                    <option value="ko" {% if site_config.default_target_lang == 'ko' %}selected{% endif %}>韩语 (ko)</option>
+                                </select>
+                            </div>
+                        </div>
+                        <div class="col-md-6">
+                            <div class="mb-3">
+                                <label class="form-label">最大上传文件大小 (MB)</label>
+                                <input type="number" class="form-control" name="max_file_size" value="{{ site_config.max_file_size }}" min="1" max="500">
+                                <small class="text-muted">用户上传PDF文件的最大大小限制</small>
+                            </div>
+                            <div class="mb-3">
+                                <label class="form-label">缓存有效期 (天)</label>
+                                <input type="number" class="form-control" name="cache_expire_days" value="{{ site_config.cache_expire_days }}" min="1" max="365">
+                                <small class="text-muted">翻译结果缓存的保留天数</small>
+                            </div>
+                            <div class="mb-3">
+                                <div class="form-check form-switch">
+                                    <input class="form-check-input" type="checkbox" name="enable_cache" id="enable_cache" {% if site_config.enable_cache %}checked{% endif %}>
+                                    <label class="form-check-label" for="enable_cache">启用翻译缓存</label>
+                                </div>
+                                <small class="text-muted">相同文件翻译时直接返回缓存结果</small>
+                            </div>
+                            <div class="mb-3">
+                                <div class="form-check form-switch">
+                                    <input class="form-check-input" type="checkbox" name="enable_guest" id="enable_guest" {% if site_config.enable_guest %}checked{% endif %}>
+                                    <label class="form-check-label" for="enable_guest">允许访客翻译</label>
+                                </div>
+                                <small class="text-muted">未登录用户可以使用翻译服务</small>
+                            </div>
+                            <div class="mb-3">
+                                <div class="form-check form-switch">
+                                    <input class="form-check-input" type="checkbox" name="enable_email_notify" id="enable_email_notify" {% if site_config.enable_email_notify %}checked{% endif %}>
+                                    <label class="form-check-label" for="enable_email_notify">邮件通知</label>
+                                </div>
+                                <small class="text-muted">翻译完成后发送邮件通知用户</small>
+                            </div>
+                        </div>
+                    </div>
+                    
+                    <button type="submit" class="btn btn-primary"><i class="bi bi-check-lg"></i> 保存配置</button>
+                </form>
+                
+                <div id="saveResult" class="mt-3" style="display:none;"></div>
+            </div>
+        </div>
+        
+        <!-- 其他配置入口 -->
         <div class="row mb-4">
             <div class="col-md-6">
                 <div class="card config-card h-100">
@@ -50,14 +136,7 @@
                     </div>
                     <div class="card-body">
                         <p class="text-muted">配置不同用户类型的权限限制，包括翻译次数、页数限制、功能权限等。</p>
-                        <p><strong>支持操作：</strong></p>
-                        <ul class="small">
-                            <li>添加新的用户类型</li>
-                            <li>编辑现有类型的权限</li>
-                            <li>删除自定义类型（系统类型不可删除）</li>
-                            <li>启用/禁用用户类型</li>
-                        </ul>
-                        <a href="{{ url_for('admin.user_types') }}" class="btn btn-primary">
+                        <a href="{{ url_for('admin.user_types') }}" class="btn btn-outline-primary">
                             <i class="bi bi-gear"></i> 管理用户类型
                         </a>
                     </div>
@@ -71,15 +150,7 @@
                     </div>
                     <div class="card-body">
                         <p class="text-muted">配置会员套餐的价格、周期、描述等，用户购买后可升级用户类型。</p>
-                        <p><strong>支持操作：</strong></p>
-                        <ul class="small">
-                            <li>添加新的会员套餐</li>
-                            <li>编辑套餐价格和描述</li>
-                            <li>删除自定义套餐（系统套餐不可删除）</li>
-                            <li>上架/下架套餐</li>
-                            <li>设置推荐套餐</li>
-                        </ul>
-                        <a href="{{ url_for('admin.membership_plans') }}" class="btn btn-primary">
+                        <a href="{{ url_for('admin.membership_plans') }}" class="btn btn-outline-primary">
                             <i class="bi bi-credit-card"></i> 管理会员套餐
                         </a>
                     </div>
@@ -88,6 +159,21 @@
         </div>
 
         <div class="row mb-4">
+            <div class="col-md-6">
+                <div class="card config-card h-100">
+                    <div class="card-header">
+                        <h6 class="mb-0"><i class="bi bi-cpu"></i> 大模型配置</h6>
+                    </div>
+                    <div class="card-body">
+                        <p class="text-muted">配置翻译使用的LLM大模型API地址、模型名称等参数。</p>
+                        <p><strong>当前模型：</strong> {{ llm_config.get('model', '未设置') }}</p>
+                        <a href="{{ url_for('admin.llm_config') }}" class="btn btn-outline-primary">
+                            <i class="bi bi-cpu"></i> 配置大模型
+                        </a>
+                    </div>
+                </div>
+            </div>
+
             <div class="col-md-6">
                 <div class="card config-card h-100">
                     <div class="card-header">
@@ -101,44 +187,69 @@
                     </div>
                 </div>
             </div>
-
-            <div class="col-md-6">
-                <div class="card config-card h-100">
-                    <div class="card-header">
-                        <h6 class="mb-0"><i class="bi bi-cpu"></i> 大模型配置</h6>
-                    </div>
-                    <div class="card-body">
-                        <p class="text-muted">配置翻译使用的LLM大模型API地址、模型名称等参数。</p>
-                        <p><strong>当前模型：</strong> {{ llm_config.model }}</p>
-                        <a href="{{ url_for('admin.llm_config') }}" class="btn btn-outline-primary">
-                            <i class="bi bi-cpu"></i> 配置大模型
-                        </a>
-                    </div>
-                </div>
-            </div>
         </div>
 
+        <!-- 系统信息 -->
         <div class="card">
             <div class="card-header"><h6 class="mb-0"><i class="bi bi-info-circle"></i> 系统信息</h6></div>
             <div class="card-body">
                 <div class="row">
                     <div class="col-md-4">
-                        <p><strong>应用名称:</strong> PDF翻译助手</p>
-                        <p><strong>版本:</strong> 2.0.0</p>
+                        <p><strong>应用名称:</strong> {{ site_config.site_name }}</p>
+                        <p><strong>版本:</strong> 2.3.1</p>
                         <p><strong>框架:</strong> Flask + SQLAlchemy</p>
                     </div>
                     <div class="col-md-4">
-                        <p><strong>缓存有效期:</strong> 30天</p>
-                        <p><strong>默认最大文件:</strong> 50MB</p>
+                        <p><strong>最大文件:</strong> {{ site_config.max_file_size }}MB</p>
+                        <p><strong>缓存有效期:</strong> {{ site_config.cache_expire_days }}天</p>
                         <p><strong>数据库:</strong> SQLite</p>
                     </div>
                     <div class="col-md-4">
-                        <p><strong>API地址:</strong> {{ llm_config.api_base }}</p>
-                        <p><strong>超时时间:</strong> {{ llm_config.timeout }}秒</p>
+                        <p><strong>API地址:</strong> {{ llm_config.get('api_base', '未设置') }}</p>
+                        <p><strong>超时时间:</strong> {{ llm_config.get('timeout', 180) }}秒</p>
                     </div>
                 </div>
             </div>
         </div>
     </main>
+    
+    <script>
+    document.getElementById('siteConfigForm').addEventListener('submit', function(e) {
+        e.preventDefault();
+        const formData = new FormData(this);
+        const data = {};
+        formData.forEach((value, key) => {
+            if (key === 'max_file_size' || key === 'cache_expire_days') {
+                data[key] = parseInt(value) || 0;
+            } else if (key === 'enable_cache' || key === 'enable_guest' || key === 'enable_email_notify') {
+                data[key] = document.getElementById(key).checked;
+            } else {
+                data[key] = value;
+            }
+        });
+        
+        fetch('/admin/settings/site', {
+            method: 'POST',
+            headers: {'Content-Type': 'application/json'},
+            body: JSON.stringify(data)
+        })
+        .then(r => r.json())
+        .then(res => {
+            const div = document.getElementById('saveResult');
+            div.style.display = 'block';
+            if (res.success) {
+                div.innerHTML = '<div class="alert alert-success"><i class="bi bi-check-circle"></i> 配置已保存！</div>';
+                setTimeout(() => div.style.display = 'none', 2000);
+            } else {
+                div.innerHTML = '<div class="alert alert-danger"><i class="bi bi-x-circle"></i> 保存失败: ' + (res.error || '未知错误') + '</div>';
+            }
+        })
+        .catch(err => {
+            const div = document.getElementById('saveResult');
+            div.style.display = 'block';
+            div.innerHTML = '<div class="alert alert-danger">请求失败: ' + err + '</div>';
+        });
+    });
+    </script>
 </body>
 </html>
\ No newline at end of file