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diff --git a/README.md b/README.md
index 5c3bead..7260f58 100644
--- a/README.md
+++ b/README.md
@@ -1,116 +1,8 @@
-# Bytom java-sdk
+## Bytom Java SDK 
 
-This page will document the API classes and ways to properly use the API.
-Subsequent new releases also maintain backward compatibility with this class
-approach. For more information, please see Bytom API reference documentation
-at [Bytom wiki](https://github.com/Bytom/bytom/wiki/API-Reference)
+Bytom java sdk contains two modules:
 
-## Basic Usage
+1. java-sdk encapsulates of the request data and return value of the bytom api,The signature of the transaction needs to be completed online.See the [java-sdk documentation](java-sdk/README.md) for details.
 
-```
-public static Client generateClient() throws BytomException {
-    String coreURL = Configuration.getValue("bytom.api.url");
-    String accessToken = Configuration.getValue("client.access.token");
-    if (coreURL == null || coreURL.isEmpty()) {
-        coreURL = "http://127.0.0.1:9888/";
-    }
-    return new Client(coreURL, accessToken);
-}
+2. tx-signer implementation offline signature of transaction, see the [tx-signer documentation](tx-signer/README.md) for details.
 
-Client client = TestUtils.generateClient();
-```
-
-## Usage
-
-* [`Step 1: Create a key`](#create-a-key)
-* [`Step 2: Create an account`](#create-an-account)
-* [`Step 3: Create an receiver`](#create-an-receiver)
-* [`Step 4: Create an asset`](#create-an-asset)
-* [`Step 5: Issue asset`](#issue-asset)
-    * [`Firstly build the transaction`](#firstly-build-the-transaction)
-    * [`Secondly sign the transaction`](#secondly-sign-the-transaction)
-    * [`Finally submit the transaction`](#finally-submit-the-transaction)
-
-> For more details, see [API methods](https://github.com/Bytom/java-sdk/blob/master/doc/index.md#api-methods)
-
-## Create a key
-
-```java
-String alias = "test";
-String password = "123456";
-
-Key.Builder builder = new Key.Builder().setAlias(alias).setPassword(password);
-Key key = Key.create(client, builder);
-```
-
-## Create an account
-
-```java
-String alias = "sender-account";
-Integer quorum = 1;
-List<String> root_xpubs = new ArrayList<String>();
-root_xpubs.add(senderKey.xpub);
-
-Account.Builder builder = new Account.Builder().setAlias(alias).setQuorum(quorum).setRootXpub(root_xpubs);
-
-Account account = Account.create(client, builder);
-```
-
-## Create an receiver
-
-```java
-String alias = receiverAccount.alias;
-String id = receiverAccount.id;
-
-Account.ReceiverBuilder receiverBuilder = new Account.ReceiverBuilder().setAccountAlias(alias).setAccountId(id);
-Receiver receiver = receiverBuilder.create(client);
-```
-
-## Create an asset
-
-```java
- String alias = "receiver-asset";
-
-List<String> xpubs = receiverAccount.xpubs;
-
-Asset.Builder builder = new Asset.Builder()
-                        .setAlias(alias)
-                        .setQuorum(1)
-                        .setRootXpubs(xpubs);
-receiverAsset = builder.create(client);
-```
-
-## Issue asset
-
-### Firstly build the transaction
-
-```java
-Transaction.Template controlAddress = new Transaction.Builder()
-        .addAction(
-                new Transaction.Action.SpendFromAccount()
-                        .setAccountId(senderAccount.id)
-                        .setAssetId(senderAsset.id)
-                        .setAmount(300000000)
-        )
-        .addAction(
-                new Transaction.Action.ControlWithAddress()
-                        .setAddress(receiverAddress.address)
-                        .setAssetId(senderAsset.id)
-                        .setAmount(200000000)
-        ).build(client);
-```
-
-### Secondly sign the transaction
-
-```java
-Transaction.Template singer = new Transaction.SignerBuilder().sign(client,
-        controlAddress, "123456");
-```
-
-### Finally submit the transaction
-
-```java
-Transaction.SubmitResponse txs = Transaction.submit(client, singer);
-```
-
-> For more details, see [API methods](https://github.com/Bytom/java-sdk/blob/master/doc/index.md#api-methods)