diff --git a/frontend/scene-generator/llm-client.js b/frontend/scene-generator/llm-client.js
index 14d473f..48f1914 100644
--- a/frontend/scene-generator/llm-client.js
+++ b/frontend/scene-generator/llm-client.js
@@ -17,33 +17,75 @@ const DEEP_SYSTEM_PROMPT = `你是一个场景代码分析专家。分析场景
 
 ## 分析目标
 
-1. **API 端点**: 识别所有 HTTP 请求地址 (URL, method, 用途)
-2. **静态参数**: 识别硬编码的业务参数 (key-value pairs)
-3. **列定义**: 识别数据表格/导出的列配置 ([field, label] pairs)
-4. **业务逻辑**: 理解数据获取和转换流程
-5. **场景类型**: 判断是 report_collection 还是 monitoring
+1. **多模式识别** (关键):
+   - 查找条件分支逻辑 (if/switch) 中基于 period_mode、reportType 等字段的分支
+   - 识别不同分支对应的 API 端点、列定义、请求格式
+   - 如果发现多模式，使用 modes 数组格式输出
+
+2. **API 端点**: 识别所有 HTTP 请求地址 (URL, method, contentType, 用途)
+   - 从 \$.ajax/fetch 调用中提取 contentType
+   - 检测请求格式: application/json 或 application/x-www-form-urlencoded
+
+3. **请求模板**: 识别请求参数结构
+   - 提取硬编码的分页参数 (rows, page, sidx, sord)
+   - 识别模板变量如 \${args.org_code}
+
+4. **数据归一化**: 识别数据处理规则
+   - 查找数据渲染/表格填充逻辑
+   - 检测数据验证条件 (哪些字段不能为空)
+
+5. **响应路径**: 识别数据在响应中的位置
+   - 如 response.content 或 response.data
 
 ## 输出格式
 
-请以 JSON 格式返回：
+### 单模式场景 (无 modes 数组):
 {
-  "sceneId": "string - 场景标识 (英文短横线)",
-  "sceneName": "string - 场景中文名",
+  "sceneId": "string",
+  "sceneName": "string",
   "sceneKind": "report_collection | monitoring",
-  "sourceSystem": "string - 来源系统名 (可选)",
-  "expectedDomain": "string - 目标域名 (可选)",
-  "targetUrl": "string | null - 目标页面URL",
-  "apiEndpoints": [
-    {"name": "string", "url": "string", "method": "GET|POST", "description": "string"}
-  ],
+  "expectedDomain": "string",
+  "targetUrl": "string",
+  "apiEndpoints": [{"name": "", "url": "", "method": "POST"}],
   "staticParams": {"key": "value"},
-  "columnDefs": [["fieldName", "中文列名"]],
-  "entryMethod": "string - 入口方法名",
-  "businessLogic": {
-    "dataFetch": "string - 数据获取逻辑描述",
-    "dataTransform": "string - 数据转换逻辑描述"
-  }
-}`;
+  "columnDefs": [["fieldName", "中文列名"]]
+}
+
+### 多模式场景 (有 modes 数组):
+{
+  "sceneId": "tq-lineloss-report",
+  "sceneName": "台区线损报表",
+  "sceneKind": "report_collection",
+  "modes": [
+    {
+      "name": "month",
+      "label": "月度报表",
+      "condition": {"field": "period_mode", "operator": "equals", "value": "month"},
+      "apiEndpoint": {
+        "name": "月度线损查询",
+        "url": "http://...",
+        "method": "POST",
+        "contentType": "application/x-www-form-urlencoded"
+      },
+      "columnDefs": [["ORG_NAME", "供电单位"], ...],
+      "requestTemplate": {"orgno": "\${args.org_code}", "rows": 1000, "page": 1},
+      "normalizeRules": {"type": "validate_all_columns", "filterNull": true},
+      "responsePath": "content"
+    },
+    {
+      "name": "week",
+      "label": "周报表",
+      "condition": {"field": "period_mode", "operator": "equals", "value": "week"},
+      "apiEndpoint": {...},
+      "columnDefs": [...],
+      ...
+    }
+  ],
+  "defaultMode": "month",
+  "modeSwitchField": "period_mode"
+}
+
+**重要**: 如果发现代码中有基于 period_mode 的 if/switch 分支，必须使用多模式格式输出！`;
 
 function buildAnalyzePrompt(sourceDir, dirContents) {
   const parts = [];