diff --git a/source/base/src/main/java/com/jd/blockchain/consts/DataCodes.java b/source/base/src/main/java/com/jd/blockchain/consts/DataCodes.java
index e3e2506c..80eaa4f7 100644
--- a/source/base/src/main/java/com/jd/blockchain/consts/DataCodes.java
+++ b/source/base/src/main/java/com/jd/blockchain/consts/DataCodes.java
@@ -121,12 +121,12 @@ public interface DataCodes {
 
 	public static final int ACCOUNT_HEADER = 0x710;
 
-	public static final int USER = 0x800;
+	public static final int USER_ACCOUNT_HEADER = 0x800;
 
 	public static final int DATA = 0x900;
 
 	// contract related;
-	public static final int CONTRACT = 0xA00;
+	public static final int CONTRACT_ACCOUNT_HEADER = 0xA00;
 
 	// ...0xA19
 	public static final int HASH = 0xB00;
diff --git a/source/ledger/ledger-model/src/main/java/com/jd/blockchain/ledger/ContractInfo.java b/source/ledger/ledger-model/src/main/java/com/jd/blockchain/ledger/ContractInfo.java
index cb1da5c4..9ee1a75b 100644
--- a/source/ledger/ledger-model/src/main/java/com/jd/blockchain/ledger/ContractInfo.java
+++ b/source/ledger/ledger-model/src/main/java/com/jd/blockchain/ledger/ContractInfo.java
@@ -5,7 +5,7 @@ import com.jd.blockchain.binaryproto.DataField;
 import com.jd.blockchain.binaryproto.PrimitiveType;
 import com.jd.blockchain.consts.DataCodes;
 
-@DataContract(code= DataCodes.CONTRACT)
+@DataContract(code= DataCodes.CONTRACT_ACCOUNT_HEADER)
 public interface ContractInfo extends AccountHeader {
 
     @DataField(order=4, primitiveType= PrimitiveType.BYTES)
diff --git a/source/ledger/ledger-model/src/main/java/com/jd/blockchain/ledger/UserInfo.java b/source/ledger/ledger-model/src/main/java/com/jd/blockchain/ledger/UserInfo.java
index 48759b9f..3ad9ed85 100644
--- a/source/ledger/ledger-model/src/main/java/com/jd/blockchain/ledger/UserInfo.java
+++ b/source/ledger/ledger-model/src/main/java/com/jd/blockchain/ledger/UserInfo.java
@@ -4,7 +4,7 @@ import com.jd.blockchain.binaryproto.DataContract;
 import com.jd.blockchain.consts.DataCodes;
 import com.jd.blockchain.crypto.PubKey;
 
-@DataContract(code= DataCodes.USER)
+@DataContract(code= DataCodes.USER_ACCOUNT_HEADER)
 public interface UserInfo extends AccountHeader {
 	
 	PubKey getDataPubKey();