diff --git a/docs/developer_guides/chap04_message_stream.md b/docs/developer_guides/chap04_message_stream.md
index 2f4767abd2..cd0a227b11 100644
--- a/docs/developer_guides/chap04_message_stream.md
+++ b/docs/developer_guides/chap04_message_stream.md
@@ -1,9 +1,7 @@
-## 8. Message Stream Service
+## 8. Message Stream
 
 
 
-#### 8.1 Overview
-
 
 
 #### 8.2 Message Stream Service API
@@ -67,6 +65,14 @@ type DescribeChannelResponse struct {
 
 #### A.3 Message Stream
 
+* Overview
+
+
+
+<img src="./figs/msg_stream_input_output.jpeg" width=700>
+
+* Interface
+
 ``` go
 type MsgType uint32
 const {
diff --git a/docs/developer_guides/chap06_master.md b/docs/developer_guides/chap06_master.md
index a1251ce5a4..d700b51a23 100644
--- a/docs/developer_guides/chap06_master.md
+++ b/docs/developer_guides/chap06_master.md
@@ -242,25 +242,75 @@ type IDResponse struct {
 
 
 
-#### 10.1 Interfaces (RPC)
+#### 10.2 Dd (Data definitions) Channel
 
-| RPC                | description                                                  |
-| :----------------- | ------------------------------------------------------------ |
-| CreateCollection   | create a collection base on schema statement                 |
-| DropCollection     | drop a collection                                            |
-| HasCollection      | whether or not a collection exists                           |
-| DescribeCollection | show a collection's schema and its descriptive statistics    |
-| ShowCollections    | list all collections                                         |
-| CreatePartition    | create a partition                                           |
-| DropPartition      | drop a partition                                             |
-| HasPartition       | whether or not a partition exists                            |
-| DescribePartition  | show a partition's name and its descriptive statistics       |
-| ShowPartitions     | list a collection's all partitions                           |
-| AllocTimestamp     | allocate a batch of consecutive timestamps                   |
-| AllocID            | allocate a batch of consecutive IDs                          |
-| AssignSegmentID    | assign segment id to insert rows (master determines which segment these rows belong to) |
-| GetSysConfigs      | get system configurations                                    |
-|                    |                                                              |
+* *CreateCollection*
+
+```go
+type CreateCollectionRequest struct {
+  RequestBase
+  DbName string
+  CollectionName string
+  DbID UniqueID
+  CollectionID UniqueID
+  Schema []bytes
+}
+```
+
+* *DropCollection*
+
+```go
+type DropCollectionRequest struct {
+  RequestBase
+  DbName string
+  CollectionName string
+  DbID UniqueID
+  CollectionID UniqueID
+}
+```
+
+* *CreatePartition*
+
+```go
+type CreatePartitionRequest struct {
+  RequestBase
+  DbName string
+  CollectionName string
+  PartitionName string
+  DbID UniqueID
+  CollectionID UniqueID
+  PartitionID UniqueID
+}
+```
+
+* *DropPartition*
+
+```go
+type DropPartitionRequest struct {
+  RequestBase
+  DbName string
+  CollectionName string
+  PartitionName string
+  DbID UniqueID
+  CollectionID UniqueID
+  PartitionID UniqueID
+}
+```
+
+* *CreateIndex*
+
+```go
+type CreateIndexRequest struct {
+  RequestBase
+  DbName string
+  CollectionName string
+  FieldName string
+  DbID UniqueID
+  CollectionID UniqueID
+  FieldID int64
+  Params [] KeyValuePair
+}
+```
 
 
 
diff --git a/docs/developer_guides/chap07_query_service.md b/docs/developer_guides/chap07_query_service.md
index 372ab47801..54d6b85f5e 100644
--- a/docs/developer_guides/chap07_query_service.md
+++ b/docs/developer_guides/chap07_query_service.md
@@ -168,6 +168,24 @@ type CreateQueryChannelResponse struct {
 
 
 
+#### 8.2 Query Channel
+
+```go
+type SearchRequest struct {
+  RequestBase
+  DbName string
+  CollectionName string
+  PartitionNames []string
+  DbID UniqueID
+  CollectionID UniqueID
+  PartitionIDs []UniqueID
+  Dsl string
+  PlaceholderGroup []byte
+}
+```
+
+
+
 #### 8.2 Query Node Interface
 
 ```go
diff --git a/docs/developer_guides/chap09_data_service.md b/docs/developer_guides/chap09_data_service.md
index 6da835e0c2..0f8a357914 100644
--- a/docs/developer_guides/chap09_data_service.md
+++ b/docs/developer_guides/chap09_data_service.md
@@ -163,6 +163,24 @@ type InsertChannelRequest struct {
 
 
 
+#### 8.2 Insert Channel
+
+```go
+type InsertRequest struct {
+  RequestBase
+  DbName string
+  CollectionName string
+  PartitionName string
+  DbID UniqueID
+  CollectionID UniqueID
+  PartitionID UniqueID
+  RowData []Blob
+  HashKeys []uint32
+}
+```
+
+
+
 #### 8.2 Data Node Interface
 
 ```go
diff --git a/docs/developer_guides/figs/msg_stream_input_output.jpeg b/docs/developer_guides/figs/msg_stream_input_output.jpeg
new file mode 100644
index 0000000000..9230491753
Binary files /dev/null and b/docs/developer_guides/figs/msg_stream_input_output.jpeg differ