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--- a/README.md
+++ b/README.md
@@ -1,2 +1,52 @@
-# irext-web-api
-Java web api for remote indexing
+# irext Java web API  
+Indexing to the specified remote index and download its IR binary file
+
+#### Usage
+1. Make the source code to a .jar file for your own project  
+
+2. Java API methods  
+
+Import classes:
+
+    import net.irext.webapi.model.*;
+    
+    import net.irext.webapi.WebAPIs;
+
+Get web API instance:
+
+    WebAPIs webApis = WebAPIs.getInstance();
+    
+Sign in for access id and token:
+
+    Admin admin = webApis.signIn(userName, password);
+    
+    int id = admin.getId();
+    
+    int token = admin.getToken();
+
+Fetch household appliances categories:
+
+    List<Category> categories = webApis.listCategories();
+    
+Fetch brands of a certain category other than STB:
+
+    List<Brand> brands = webApis.listBrands(category.getId());
+
+Fetch cities (in China) for STB:
+
+    List<City> provinces = webApis.listProvinces();
+
+    List<City> cities = webApis.listCities(provincePrefix);
+
+Fetch STB operators of a certain city:
+
+    List<StbOperator>; operators = webApis.listOperators(cityCode);
+
+Fetch remote indexes of a certain brand or STB operator:
+
+    List<RemoteIndex> remoteIndexes = webApis.listRemoteIndexes(category.getId(), brand.getId(), city.getCode(), operator.getOperator_id());
+
+Download IR binary for certain remote index:
+
+    InputStream is = webApis.downloadBin(remoteIndex.getRemote_map(), remoteIndex.getId());
+