diff --git a/docs/geocode.md b/docs/geocode.md
new file mode 100644
index 0000000..2870b0b
--- /dev/null
+++ b/docs/geocode.md
@@ -0,0 +1,41 @@
+# Geocode 地理编码/逆编码模块
+
+
+```javascript
+import { Geocode } from 'react-native-baidumap-sdk'
+
+// 地理编码，也就是地址 -> 坐标
+const searchResult = await Geocode.search('海龙大厦', '北京市')
+
+// 逆地理编码，也就是坐标 -> 地址
+const reverseResult = await Geocode.reverse({ latitude: 39, longitude: 113 })
+```
+
+## Methods
+
+### `search(address: string, city: string = ''): Promise<SearchResult>`
+地理编码，地址 -> 坐标
+
+#### `SearchResult`
+- `address`: 应该是与传进来的地址是一样的
+- `latitude`: 转换之后的经度
+- `longitude`: 转换之后的经度
+
+### `reverse(coordinate: LatLng): Promise<ReverseResult>`
+逆地理编码，坐标 -> 地址
+
+#### `ReverseResult`
+- `latitude`: 应该与传进来的经度是一样的
+- `longitude`: 应该与传进来的纬度是一样的
+- `country`: 国家
+- `countryCode`: 国家代码
+- `province`: 省/直辖市
+- `city`: 城市
+- `cityCode`: 城市代码
+- `district`: 城区
+- `street`: 街道
+- `streetNumber`: 街道编号
+- `businessCircle`: 商圈
+- `adCode`: 邮政编码
+- `address`: 完整地址
+- `description`: 语义化描述
\ No newline at end of file
diff --git a/docs/location.md b/docs/location.md
index 852f42e..6af759e 100644
--- a/docs/location.md
+++ b/docs/location.md
@@ -4,6 +4,8 @@
 
 用法：
 ```javascript
+import { Location } from 'react-native-baidumap-sdk'
+
 await Location.init()
 Location.addLocationListener(location => console.log(location))
 Location.start()
@@ -31,9 +33,9 @@ Location.start()
 添加监听函数
 
 #### `Result`
-- `latitude: number` 经度
-- `longitude: number` 纬度
-- `accuracy: number` 精度
-- `altitude: number` 海拔
-- `speed: number` 速度
-- `direction: number` 方向
\ No newline at end of file
+- `latitude`: 经度
+- `longitude`: 纬度
+- `accuracy`: 精度
+- `altitude`: 海拔
+- `speed`: 速度
+- `direction`: 方向
\ No newline at end of file
diff --git a/lib/js/modules/geocode.js b/lib/js/modules/geocode.js
index 67ec56d..70fba7a 100644
--- a/lib/js/modules/geocode.js
+++ b/lib/js/modules/geocode.js
@@ -22,7 +22,7 @@ type ReverseResult = {
 } & LatLng
 
 export default {
-  search(address: string, city: string) : Promise<SearchResult> {
+  search(address: string, city: string = '') : Promise<SearchResult> {
     return BaiduMapGeocode.search(address, city)
   },
   reverse(coordinate: LatLng) : Promise<ReverseResult> {
diff --git a/package.json b/package.json
index f04f9c5..b10f11a 100644
--- a/package.json
+++ b/package.json
@@ -8,7 +8,7 @@
     "location",
     "baidumap"
   ],
-  "version": "0.2.0",
+  "version": "0.3.0",
   "author": "7c00 <i@7c00.cc>",
   "repository": {
     "type": "git",
diff --git a/readme.md b/readme.md
index 07a6879..f4a6025 100644
--- a/readme.md
+++ b/readme.md
@@ -69,6 +69,7 @@ render() {
   - [Marker](docs/marker.md)
   - [Polygon](docs/polygon.md)
 - [Location](docs/location.md)
+- [Geocode](docs/geocode.md)
 
 [npm]: https://www.npmjs.com/package/react-native-baidumap-sdk
 [version-badge]: https://badge.fury.io/js/react-native-baidumap-sdk.svg