diff --git a/adi-common/src/main/java/com/moyz/adi/common/enums/ErrorEnum.java b/adi-common/src/main/java/com/moyz/adi/common/enums/ErrorEnum.java
index 41f666d..af4e93b 100644
--- a/adi-common/src/main/java/com/moyz/adi/common/enums/ErrorEnum.java
+++ b/adi-common/src/main/java/com/moyz/adi/common/enums/ErrorEnum.java
@@ -33,6 +33,8 @@ public enum ErrorEnum {
     B_LLM_SECRET_KEY_NOT_SET("B0009", "LLM的secret key没设置"),
     B_MESSAGE_NOT_FOUND("B0008", "消息不存在"),
     B_LLM_SERVICE_DISABLED("B0009", "LLM服务不可用"),
+    B_KNOWLEDGE_BASE_IS_EMPTY("B0010", "知识库内容为空"),
+    B_KNOWLEDGE_BASE_NO_ANSWER("B0011", "[无答案]")
     ;
 
     private String code;
diff --git a/adi-common/src/main/java/com/moyz/adi/common/helper/SSEEmitterHelper.java b/adi-common/src/main/java/com/moyz/adi/common/helper/SSEEmitterHelper.java
index 409df59..c3e8aa7 100644
--- a/adi-common/src/main/java/com/moyz/adi/common/helper/SSEEmitterHelper.java
+++ b/adi-common/src/main/java/com/moyz/adi/common/helper/SSEEmitterHelper.java
@@ -47,7 +47,7 @@ public class SSEEmitterHelper {
         }
         stringRedisTemplate.opsForValue().set(askingKey, "1", 15, TimeUnit.SECONDS);
         try {
-            sseEmitter.send(SseEmitter.event().name("start"));
+            sseEmitter.send(SseEmitter.event().name("[START]"));
         } catch (IOException e) {
             log.error("error", e);
             sseEmitter.completeWithError(e);
@@ -65,7 +65,7 @@ public class SSEEmitterHelper {
                 throwable -> {
                     try {
                         log.error("sseEmitter error,uid:{},on error:{}", user.getId(), throwable);
-                        sseEmitter.send(SseEmitter.event().name("error").data(throwable.getMessage()));
+                        sseEmitter.send(SseEmitter.event().name("[ERROR]").data(throwable.getMessage()));
                     } catch (IOException e) {
                         log.error("error", e);
                     } finally {
@@ -84,9 +84,19 @@ public class SSEEmitterHelper {
         });
     }
 
+    public void sendAndComplete(SseEmitter sseEmitter, String msg){
+        try {
+            sseEmitter.send(SseEmitter.event().name("[START]"));
+            sseEmitter.send(SseEmitter.event().name("[DONE]").data(msg));
+        } catch (IOException e) {
+            throw new RuntimeException(e);
+        }
+        sseEmitter.complete();
+    }
+
     public void sendErrorMsg(SseEmitter sseEmitter, String errorMsg) {
         try {
-            sseEmitter.send(SseEmitter.event().name("error").data(errorMsg));
+            sseEmitter.send(SseEmitter.event().name("[ERROR]").data(errorMsg));
         } catch (IOException e) {
             throw new RuntimeException(e);
         }
diff --git a/adi-common/src/main/java/com/moyz/adi/common/interfaces/AbstractLLMService.java b/adi-common/src/main/java/com/moyz/adi/common/interfaces/AbstractLLMService.java
index 9643d29..dc68260 100644
--- a/adi-common/src/main/java/com/moyz/adi/common/interfaces/AbstractLLMService.java
+++ b/adi-common/src/main/java/com/moyz/adi/common/interfaces/AbstractLLMService.java
@@ -99,7 +99,8 @@ public abstract class AbstractLLMService<T> {
         } else {
             tokenStream = chatAssistant.chat(params.getUserMessage());
         }
-        tokenStream.onNext((content) -> {
+        tokenStream
+                .onNext((content) -> {
                     log.info("get content:{}", content);
                     //加空格配合前端的fetchEventSource进行解析，见https://github.com/Azure/fetch-event-source/blob/45ac3cfffd30b05b79fbf95c21e67d4ef59aa56a/src/parse.ts#L129-L133
                     try {
@@ -117,7 +118,7 @@ public abstract class AbstractLLMService<T> {
                     String meta = JsonUtil.toJson(chatMeta).replaceAll("\r\n", "");
                     log.info("meta:" + meta);
                     try {
-                        params.getSseEmitter().send(" [META]" + meta);
+                        params.getSseEmitter().send(SseEmitter.event().name("[DONE]").data(" [META]" + meta));
                     } catch (IOException e) {
                         log.error("stream onComplete error", e);
                         throw new RuntimeException(e);
@@ -133,7 +134,7 @@ public abstract class AbstractLLMService<T> {
                         if(StringUtils.isBlank(errorMsg)){
                             errorMsg = error.getMessage();
                         }
-                        params.getSseEmitter().send(SseEmitter.event().name("error").data(errorMsg));
+                        params.getSseEmitter().send(SseEmitter.event().name("[ERROR]").data(errorMsg));
                     } catch (IOException e) {
                         log.error("sse error", e);
                     }
diff --git a/adi-common/src/main/java/com/moyz/adi/common/service/KnowledgeBaseService.java b/adi-common/src/main/java/com/moyz/adi/common/service/KnowledgeBaseService.java
index 1c053eb..2eafaaf 100644
--- a/adi-common/src/main/java/com/moyz/adi/common/service/KnowledgeBaseService.java
+++ b/adi-common/src/main/java/com/moyz/adi/common/service/KnowledgeBaseService.java
@@ -20,6 +20,7 @@ import dev.langchain4j.data.document.parser.TextDocumentParser;
 import dev.langchain4j.data.document.parser.apache.pdfbox.ApachePdfBoxDocumentParser;
 import dev.langchain4j.data.document.parser.apache.poi.ApachePoiDocumentParser;
 import dev.langchain4j.data.message.AiMessage;
+import dev.langchain4j.model.input.Prompt;
 import dev.langchain4j.model.output.Response;
 import jakarta.annotation.Resource;
 import lombok.extern.slf4j.Slf4j;
@@ -265,14 +266,19 @@ public class KnowledgeBaseService extends ServiceImpl<KnowledgeBaseMapper, Knowl
         log.info("retrieveAndPushToLLM,kbUuid:{},userId:{}", kbUuid, user.getId());
         KnowledgeBase knowledgeBase = getOrThrow(kbUuid);
 
-        String prompt = ragService.retrieveAndCreatePrompt(kbUuid, req.getQuestion()).text();
+        Prompt prompt = ragService.retrieveAndCreatePrompt(kbUuid, req.getQuestion());
+        if(null == prompt){
+            sseEmitterHelper.sendAndComplete(sseEmitter, B_KNOWLEDGE_BASE_NO_ANSWER.getInfo());
+            return;
+        }
+        String promptText = prompt.text();
         SseAskParams sseAskParams = new SseAskParams();
         sseAskParams.setSystemMessage(StringUtils.EMPTY);
         sseAskParams.setSseEmitter(sseEmitter);
-        sseAskParams.setUserMessage(prompt);
+        sseAskParams.setUserMessage(promptText);
         sseAskParams.setModelName(req.getModelName());
         sseEmitterHelper.process(user, sseAskParams, (response, promptMeta, answerMeta) -> {
-            knowledgeBaseQaRecordService.createNewRecord(user, knowledgeBase, req.getQuestion(), prompt, promptMeta.getTokens(), response, answerMeta.getTokens());
+            knowledgeBaseQaRecordService.createNewRecord(user, knowledgeBase, req.getQuestion(), promptText, promptMeta.getTokens(), response, answerMeta.getTokens());
             userDayCostService.appendCostToUser(user, promptMeta.getTokens() + answerMeta.getTokens());
         });
     }