diff --git a/docs/en/Cookbook/rag.md b/docs/en/Cookbook/rag.md
index 6af80af0..0ec57caf 100644
--- a/docs/en/Cookbook/rag.md
+++ b/docs/en/Cookbook/rag.md
@@ -360,8 +360,8 @@ If using Milvus, we also need to pass the `doc_fields` parameter to `Document`,
 
 ```python
 doc_fields = {
-    'comment': DocField(data_type=DocField.DTYPE_VARCHAR, max_size=65535, default_value=' '),
-    'signature': DocField(data_type=DocField.DTYPE_VARCHAR, max_size=32, default_value=' '),
+    'comment': DocField(data_type=DataType.VARCHAR, max_size=65535, default_value=' '),
+    'signature': DocField(data_type=DataType.VARCHAR, max_size=32, default_value=' '),
 }
 ```
 
@@ -379,7 +379,7 @@ Here is a complete example using Milvus as the storage backend:
 import os
 import lazyllm
 from lazyllm import bind, config
-from lazyllm.tools.rag import DocField
+from lazyllm.tools.rag import DocField, DataType
 import shutil
 
 class TmpDir:
@@ -406,8 +406,8 @@ milvus_store_conf = {
 }
 
 doc_fields = {
-    'comment': DocField(data_type=DocField.DTYPE_VARCHAR, max_size=65535, default_value=' '),
-    'signature': DocField(data_type=DocField.DTYPE_VARCHAR, max_size=32, default_value=' '),
+    'comment': DocField(data_type=DataType.VARCHAR, max_size=65535, default_value=' '),
+    'signature': DocField(data_type=DataType.VARCHAR, max_size=32, default_value=' '),
 }
 
 prompt = 'You will play the role of an AI Q&A assistant and complete a dialogue task.'\
diff --git a/docs/zh/Cookbook/rag.md b/docs/zh/Cookbook/rag.md
index cca93307..54197d77 100644
--- a/docs/zh/Cookbook/rag.md
+++ b/docs/zh/Cookbook/rag.md
@@ -358,8 +358,8 @@ milvus_store_conf = {
 
 ```python
 doc_fields = {
-    'comment': DocField(data_type=DocField.DTYPE_VARCHAR, max_size=65535, default_value=' '),
-    'signature': DocField(data_type=DocField.DTYPE_VARCHAR, max_size=32, default_value=' '),
+    'comment': DocField(data_type=DataType.VARCHAR, max_size=65535, default_value=' '),
+    'signature': DocField(data_type=DataType.VARCHAR, max_size=32, default_value=' '),
 }
 ```
 
@@ -377,7 +377,7 @@ doc_fields = {
 import os
 import lazyllm
 from lazyllm import bind, config
-from lazyllm.tools.rag import DocField
+from lazyllm.tools.rag import DocField, DataType
 import shutil
 
 class TmpDir:
@@ -404,8 +404,8 @@ milvus_store_conf = {
 }
 
 doc_fields = {
-    'comment': DocField(data_type=DocField.DTYPE_VARCHAR, max_size=65535, default_value=' '),
-    'signature': DocField(data_type=DocField.DTYPE_VARCHAR, max_size=32, default_value=' '),
+    'comment': DocField(data_type=DataType.VARCHAR, max_size=65535, default_value=' '),
+    'signature': DocField(data_type=DataType.VARCHAR, max_size=32, default_value=' '),
 }
 
 prompt = 'You will play the role of an AI Q&A assistant and complete a dialogue task.'\
diff --git a/lazyllm/docs/tools.py b/lazyllm/docs/tools.py
index bb7ce80e..5b3232a0 100644
--- a/lazyllm/docs/tools.py
+++ b/lazyllm/docs/tools.py
@@ -384,7 +384,7 @@
 >>> document2.create_node_group(name='sentences', transform=SentenceSplitter, chunk_size=512, chunk_overlap=50)
 >>> retriever2 = Retriever([document1, document2], group_name='sentences', similarity='cosine', similarity_cut_off=0.4, embed_keys=['local'], topk=3)
 >>> print(retriever2("user query"))
-
+>>>
 >>> filters = {
 >>>     "author": ["A", "B", "C"],
 >>>     "public_year": [2002, 2003, 2004],