diff --git a/README.md b/README.md
index 6fc5538..f2dbfd7 100644
--- a/README.md
+++ b/README.md
@@ -227,6 +227,6 @@ Web UI 可以实现如下功能：
 - [x] VUE 前端
 
 ## 项目交流群
-![二维码](img/qr_code_27.jpg)
+![二维码](img/qr_code_28.jpg)
 
 🎉 langchain-ChatGLM 项目交流群，如果你也对本项目感兴趣，欢迎加入群聊参与讨论交流。
diff --git a/chains/local_doc_qa.py b/chains/local_doc_qa.py
index e0411f0..25016f7 100644
--- a/chains/local_doc_qa.py
+++ b/chains/local_doc_qa.py
@@ -278,7 +278,7 @@ class LocalDocQA:
             if not one_content_segmentation:
                 text_splitter = ChineseTextSplitter(pdf=False, sentence_size=sentence_size)
                 docs = text_splitter.split_documents(docs)
-            if os.path.isdir(vs_path):
+            if os.path.isdir(vs_path) and os.path.isfile(vs_path+"/index.faiss"):
                 vector_store = load_vector_store(vs_path, self.embeddings)
                 vector_store.add_documents(docs)
             else:
@@ -298,7 +298,10 @@ class LocalDocQA:
         vector_store.score_threshold = self.score_threshold
         related_docs_with_score = vector_store.similarity_search_with_score(query, k=self.top_k)
         torch_gc()
-        prompt = generate_prompt(related_docs_with_score, query)
+        if len(related_docs_with_score)>0:
+            prompt = generate_prompt(related_docs_with_score, query)
+        else:
+            prompt = query
 
         for answer_result in self.llm.generatorAnswer(prompt=prompt, history=chat_history,
                                                       streaming=streaming):
diff --git a/img/qr_code_28.jpg b/img/qr_code_28.jpg
new file mode 100644
index 0000000..b79bf45
Binary files /dev/null and b/img/qr_code_28.jpg differ
diff --git a/models/chatglm_llm.py b/models/chatglm_llm.py
index 6c16d25..6e84234 100644
--- a/models/chatglm_llm.py
+++ b/models/chatglm_llm.py
@@ -52,7 +52,7 @@ class ChatGLM(BaseAnswer, LLM, ABC):
             for inum, (stream_resp, _) in enumerate(self.checkPoint.model.stream_chat(
                     self.checkPoint.tokenizer,
                     prompt,
-                    history=history[-self.history_len:-1] if self.history_len > 0 else [],
+                    history=history[-self.history_len:] if self.history_len > 0 else [],
                     max_length=self.max_token,
                     temperature=self.temperature
             )):
diff --git a/models/moss_llm.py b/models/moss_llm.py
index 084e761..c608edb 100644
--- a/models/moss_llm.py
+++ b/models/moss_llm.py
@@ -55,7 +55,7 @@ class MOSSLLM(BaseAnswer, LLM, ABC):
                          history: List[List[str]] = [],
                          streaming: bool = False):
         if len(history) > 0:
-            history = history[-self.history_len:-1] if self.history_len > 0 else []
+            history = history[-self.history_len:] if self.history_len > 0 else []
             prompt_w_history = str(history)
             prompt_w_history += '<|Human|>: ' + prompt + '<eoh>'
         else:
diff --git a/webui.py b/webui.py
index 49b764b..ebcc5e1 100644
--- a/webui.py
+++ b/webui.py
@@ -87,7 +87,7 @@ def get_answer(query, vs_path, history, mode, score_threshold=VECTOR_SEARCH_SCOR
             yield history + [[query,
                               "请选择知识库后进行测试，当前未选择知识库。"]], ""
     else:
-        for answer_result in local_doc_qa.llm.generatorAnswer(prompt=query, history=history[:-1],
+        for answer_result in local_doc_qa.llm.generatorAnswer(prompt=query, history=history,
                                                               streaming=streaming):
             resp = answer_result.llm_output["answer"]
             history = answer_result.history