diff --git a/src/utils/sse/chatSSE.ts b/src/utils/sse/chatSSE.ts
index ca38551..d780cab 100644
--- a/src/utils/sse/chatSSE.ts
+++ b/src/utils/sse/chatSSE.ts
@@ -81,7 +81,12 @@ export async function createSSEConnection(
             if (msg.trim()) {
               const { eventName, data } = parseSSEMessage(msg);
               if (eventName && data) {
-                onEvent(eventName, data);
+                // 适配后端返回的嵌套数据格式
+                // 后端返回格式: { type: "chat", event: "start", data: {...}, timestamp: "..." }
+                // 实际事件类型在 data.event，实际数据在 data.data
+                const actualEventName = data.event || eventName;
+                const actualData = data.data || data;
+                onEvent(actualEventName, actualData);
               }
             }
           }