diff --git a/README.md b/README.md
index 94a337c..fd3a3f0 100644
--- a/README.md
+++ b/README.md
@@ -8,7 +8,7 @@
 
 name | type | description | example 
 :---:|:--:|:--:|:---:|
-usr | string | usrID | xiaotian
+usrId | string | usrID | 89wvh4ee
 
 **Response**
 
@@ -16,20 +16,331 @@ name | type | description | example
 :---:|:--:|:--:|:---:|
 isError | bool | requset error | false
 code | num | request status | 404
-msg | string | error message | Bad Connection
+msg | string | error message | "Bad Connection"
 data | object | request data | {}
-data.usrStatus | string | user status | null
-data.usrGroup | string | user group id | dj8r9de3
+data.status | string | user status | "null"
+data.id | string | user id | "89wvh4ee"
+data.alias | string | user profile alias | "ben"
+data.img | string | user profile pic url | "https://api.yimian.xyz/img?type=head"
+data.groupId | string | user group id | "dj8r9de3"
 
 
 **code List**
 [status code reference](https://en.wikipedia.org/wiki/List_of_HTTP_status_codes)
 
-**data.usrStatus List**
+**data.status List**
 
 name | description 
 :---:|:--:|
-null | no such user
+undefined | no such usr before 
+null | not in process
 holding | is holding a register
 joining | is joining a register
 inGroup | is already in a group
+
+**Example**
+
+```js
+{
+	isError: false,
+	code: 200,
+	msg: "",
+	data: {
+		status: "holding",
+		id: "di3edo9s",
+		alias: "小明",
+		img: "https://api.yimian.xyz/img?type=head&id=3",
+		groupId: "8dk3d91k"
+	}
+
+}
+
+```
+
+
+
+ - `/api/getGroupInfo.php`:
+
+**Params**
+
+name | type | description | example 
+:---:|:--:|:--:|:---:|
+groupId | string | groupID | dk380we3
+
+**Response**
+
+name | type | description | example 
+:---:|:--:|:--:|:---:|
+isError | bool | requset error | false
+code | num | request status | 404
+msg | string | error message | "Bad Connection"
+data | object | request data | {}
+data.status | string | group status | "null"
+data.id | string | group id | "dk380we3"
+data.totalNum | number | total group members number | 6
+data.alias | string | group profile alias | "凤凰传奇"
+data.members | array | group members | []
+data.members[].id | string | userID | "dj8r9de3"
+data.members[].status | string | user status | "null"
+data.members[].alias | string | user profile alias | "ben"
+data.members[].img | string | user profile pic url | "https://api.yimian.xyz/img?type=head"
+
+**code List**
+[status code reference](https://en.wikipedia.org/wiki/List_of_HTTP_status_codes)
+
+**data.status List**
+
+name | description 
+:---:|:--:|
+undefined | no such group 
+forming | group is being formed
+running | group is normally running
+dismissed | group is already dimissed
+
+
+**data.members[].status List**
+
+name | description 
+:---:|:--:|
+undefined | no such usr before 
+null | not in process
+holding | is holding a register
+joining | is joining a register
+inGroup | is already in a group
+
+
+**Example**
+
+```js
+{
+	isError: false,
+	code: 200,
+	msg: "",
+	data: {
+		status: "forming",
+		alias: "凤凰传奇",
+		totalNum: 6,
+		members: [
+			{
+				id: "di3edo9s",
+				status: "holding",
+				alias: "小明",
+				img: "https://api.yimian.xyz/img?type=head&id=3"
+			},
+			{
+				id: "dv49do9s",
+				status: "joining",
+				alias: "大明",
+				img: "https://api.yimian.xyz/img?type=head&id=4"
+			},
+			{
+				id: "do9sdi3e",
+				status: "joining",
+				alias: "二明",
+				img: "https://api.yimian.xyz/img?type=head&id=5"
+			}
+		]
+	}
+
+}
+
+```
+
+
+ - `/api/setUsrInfo.php`:
+
+**Method**
+ - POST
+ - GET
+
+**Params**
+
+name | type | description | example 
+:---:|:--:|:--:|:---:|
+id | string | usrID (need to be unique) | 89wvh4ee
+alias | string | user profile alias | 小明
+img | string | user profile picture url | https://api.yimian.xyz/img?type=head&id=3
+
+**Response**
+
+name | type | description | example 
+:---:|:--:|:--:|:---:|
+isError | bool | requset error | false
+code | num | request status | 404
+msg | string | error message | "Bad Connection"
+
+**code List**
+[status code reference](https://en.wikipedia.org/wiki/List_of_HTTP_status_codes)
+
+**Sepcial Code List**
+
+code | description 
+:---:|:--:|
+501 | User Already Exist
+502 | invalid user id
+503 | invalid usr alias
+504 | invalid usr profile picture url
+
+
+**Example**
+```
+/api/setUsrInfo.php?id=e23sr3ed&alias=中明&img=https://api.yimian.xyz/img?type=head&id=8
+```
+
+```js
+{
+	isError: false,
+	code: 200,
+	msg: "",
+}
+
+```
+
+
+
+ - `/api/setNewGroup.php`:
+
+**Method**
+ - POST
+ - GET
+
+**Params**
+
+name | type | description | example 
+:---:|:--:|:--:|:---:|
+alias | string | group profile alias | 凤凰传奇
+num | number | group total number | 7
+threshold | number | system threshold | 20
+
+**Response**
+
+name | type | description | example 
+:---:|:--:|:--:|:---:|
+isError | bool | requset error | false
+code | num | request status | 404
+msg | string | error message | "Bad Connection"
+
+**code List**
+[status code reference](https://en.wikipedia.org/wiki/List_of_HTTP_status_codes)
+
+**Sepcial Code List**
+
+code | description 
+:---:|:--:|
+502 | invalid group number
+503 | invalid group alias
+504 | invalid group threshold
+
+
+**Example**
+```
+/api/setNewGroup.php?alias=凤凰传奇&num=7&threshold=20
+```
+
+```js
+{
+	isError: false,
+	code: 200,
+	msg: "",
+}
+
+```
+
+
+ - `/api/joinGroup.php`:
+
+**Method**
+ - POST
+ - GET
+
+**Params**
+
+name | type | description | example 
+:---:|:--:|:--:|:---:|
+usrID | string | user ID | 89wvh4ee
+groupID | string | group ID | d83jdle3
+
+**Response**
+
+name | type | description | example 
+:---:|:--:|:--:|:---:|
+isError | bool | requset error | false
+code | num | request status | 404
+msg | string | error message | "Bad Connection"
+
+**code List**
+[status code reference](https://en.wikipedia.org/wiki/List_of_HTTP_status_codes)
+
+**Sepcial Code List**
+
+code | description 
+:---:|:--:|
+501 | invalid group id
+502 | invalid user id
+503 | user already in other group
+504 | group is full
+505 | group is canceled
+
+
+**Example**
+```
+/api/joinGroup.php?groupID=e23sr3ed&usrID=d8ei3dd2
+```
+
+```js
+{
+	isError: false,
+	code: 200,
+	msg: "",
+}
+
+```
+
+
+ - `/api/cancelGroup.php`:
+
+**Method**
+ - POST
+ - GET
+
+**Params**
+
+name | type | description | example 
+:---:|:--:|:--:|:---:|
+usrID | string | user ID | 89wvh4ee
+groupID | string | group ID | d83jdle3
+
+**Response**
+
+name | type | description | example 
+:---:|:--:|:--:|:---:|
+isError | bool | requset error | false
+code | num | request status | 404
+msg | string | error message | "Bad Connection"
+
+**code List**
+[status code reference](https://en.wikipedia.org/wiki/List_of_HTTP_status_codes)
+
+**Sepcial Code List**
+
+code | description 
+:---:|:--:|
+501 | invalid group id
+502 | invalid user id
+503 | this user have no right to cancel this group
+504 | group was already canceled
+
+
+**Example**
+```
+/api/cancelGroup.php?groupID=e23sr3ed&usrID=d8ei3dd2
+```
+
+```js
+{
+	isError: false,
+	code: 200,
+	msg: "",
+}
+
+```
\ No newline at end of file