diff --git a/src/main/java/com/knowledge/base/application/service/LLMAppServiceImpl.java b/src/main/java/com/knowledge/base/application/service/LLMAppServiceImpl.java
index 37c45a1..e1c6a02 100644
--- a/src/main/java/com/knowledge/base/application/service/LLMAppServiceImpl.java
+++ b/src/main/java/com/knowledge/base/application/service/LLMAppServiceImpl.java
@@ -7,6 +7,7 @@ import lombok.extern.slf4j.Slf4j;
 import org.springframework.stereotype.Service;
 import org.springframework.web.servlet.mvc.method.annotation.SseEmitter;
 
+import java.io.IOException;
 import java.util.Map;
 
 @Service
@@ -23,32 +24,23 @@ public class LLMAppServiceImpl implements LLMAppService {
 
     @Override
     public SseEmitter ask(String llmToken, String question, Map<String, Object> params) throws Exception {
-        SseEmitter emitter = new SseEmitter(0L); // 不超时
+        SseEmitter emitter = new SseEmitter(0L); // 不设超时
 
-        try {
-            FilteredSseOutputAdapter adapter = new FilteredSseOutputAdapter(emitter);
-            // 异步执行，避免阻塞返回
-            new Thread(() -> {
+        new Thread(() -> {
+            try {
+                FilteredSseOutputAdapter adapter = new FilteredSseOutputAdapter(emitter);
+                llmServiceFactory.current().streamAnswer(llmToken, question, params, adapter);
+            } catch (Exception e) {
+                log.error("LLM调用异常", e);
                 try {
-                    llmServiceFactory.current().streamAnswer(llmToken, question, params, adapter);
-                } catch (Exception e) {
-                    log.error("LLM流式调用异常", e);
-                    try {
-                        emitter.send(SseEmitter.event().data("{\"error\": \"LLM异常\"}"));
-                    } catch (Exception ignored) {
-                        log.error("error", ignored);
-                    }
+                    emitter.send(SseEmitter.event().data("{\"error\": \"LLM异常\"}"));
                     emitter.completeWithError(e);
+                } catch (IOException ioException) {
+                    log.warn("SSE发送错误信息失败", ioException);
                 }
-            }).start();
-
-        } catch (Exception e) {
-            log.error("LLM初始化异常", e);
-            emitter.send(SseEmitter.event().data("{\"error\": \"LLM异常\"}"));
-            emitter.completeWithError(e);
-        }
+            }
+        }).start();
 
         return emitter;
     }
 }
-
diff --git a/src/main/java/com/knowledge/base/infrastructure/util/http/FilteredSseOutputAdapter.java b/src/main/java/com/knowledge/base/infrastructure/util/http/FilteredSseOutputAdapter.java
index 802b80e..f3e84fb 100644
--- a/src/main/java/com/knowledge/base/infrastructure/util/http/FilteredSseOutputAdapter.java
+++ b/src/main/java/com/knowledge/base/infrastructure/util/http/FilteredSseOutputAdapter.java
@@ -15,7 +15,8 @@ public class FilteredSseOutputAdapter implements WriterAdapter {
     private final SseEmitter emitter;
     private static final ObjectMapper mapper = new ObjectMapper();
 
-    private Map<String, Object> lastChunk = new HashMap<>();
+    private final Map<String, Object> lastChunk = new HashMap<>();
+    private boolean closed = false;
 
     public FilteredSseOutputAdapter(SseEmitter emitter) {
         this.emitter = emitter;
@@ -41,27 +42,30 @@ public class FilteredSseOutputAdapter implements WriterAdapter {
                 lastChunk.put("textResponse", original.get("textResponse"));
             }
 
-            // 只缓存 sources，不立即发送
+            // sources 只保存不立刻发
             if (original.containsKey("sources")) {
                 lastChunk.put("sources", original.get("sources"));
             }
 
-            if(original.containsKey("close")) {
-                filtered.put("close", original.get("close"));
+            // close 也缓存并判断是否最后一条
+            if (original.containsKey("close")) {
                 lastChunk.put("close", original.get("close"));
             }
 
-            // 最后一条才合并 sources 输出
             if (Boolean.TRUE.equals(original.get("close"))) {
-                // 合并缓存中的 sources
+                // 合并缓存数据并一次性输出
                 filtered.putAll(lastChunk);
-                lastChunk.clear(); // 清空缓存
+                lastChunk.clear();
+
                 String payload = mapper.writeValueAsString(filtered);
                 emitter.send(SseEmitter.event().data(payload));
-                // 增加主动关闭连接逻辑
-                emitter.complete();
+
+                if (!closed) {
+                    closed = true;
+                    emitter.complete();
+                }
             } else if (!filtered.isEmpty()) {
-                // 普通中间片段
+                // 中间段
                 String payload = mapper.writeValueAsString(filtered);
                 emitter.send(SseEmitter.event().data(payload));
             }