diff --git a/bg/api/ac_chain.proto b/bdchain/api/ac_chain.proto
similarity index 51%
rename from bg/api/ac_chain.proto
rename to bdchain/api/ac_chain.proto
index bdb1491..e99a20a 100644
--- a/bg/api/ac_chain.proto
+++ b/bdchain/api/ac_chain.proto
@@ -1,31 +1,31 @@
 syntax = "proto3";
 
-package bg.api;
+package bdchain.api;
 
-import "bg/api/common.proto";
+import "bdchain/api/common.proto";
 
-option go_package = "bg/api/protobuf/ac_chain";
-option java_package = "bg.protobuf";
-option java_outer_classname = "AcChainProto";
+option go_package = "bdchain/api/protobuf/ac_chain";
+option java_package = "bdchain.protobuf";
+option java_outer_classname = "AccountingChainProto";
 option java_multiple_files = true;
 
-service AcChain {
+service AccountingChain {
     rpc BlockNumber (BlockNumberRequest) returns (BlockNumberResponse);
     rpc GetBlockByNumber (GetBlockByNumberRequest) returns (Block);
     rpc GetBlockByHash (GetBlockByHashRequest) returns (Block);
-    rpc GetMessageByHash (GetMessageByHashRequest) returns (Block);
-    rpc GetMessageByBlockNumberAndIndex (GetMessageByBlockNumberAndIndexRequest) returns (Message);
-    rpc GetMessageByBlockHashAndIndex (GetMessageByBlockHashAndIndexRequest) returns (Message);
+    rpc GetTransactionByHash (GetTransactionByHashRequest) returns (Block);
+    rpc GetTransactionByBlockNumberAndIndex (GetTransactionByBlockNumberAndIndexRequest) returns (Transaction);
+    rpc GetTransactionByBlockHashAndIndex (GetTransactionByBlockHashAndIndexRequest) returns (Transaction);
 }
 
-message Message {
-    uint64 block_number = 1; // 消息所在的区块的区块号，当消息处于待确认状态时为`null`
-    bytes block_hash = 2; // 消息所在的区块的哈希，当消息处于待确认状态时为`null`
-    uint32 index = 3; // 消息在区块中的位置index，当消息处于待确认状态时为`null`
-    bytes hash = 4; // 消息的哈希
-    MessageType type = 5; // 消息类型
+message Transaction {
+    uint64 block_number = 1; // 事务所在的区块的区块号，当事务处于待确认状态时为`null`
+    bytes block_hash = 2; // 事务所在的区块的哈希，当事务处于待确认状态时为`null`
+    uint32 index = 3; // 事务在区块中的位置index，当事务处于待确认状态时为`null`
+    bytes hash = 4; // 事务的哈希
+    TransactionType type = 5; // 事务类型
     bytes from = 6; // 发送账户地址
-    uint64 nonce = 7; // 这条消息之前发送者所发送的消息数量
+    uint64 nonce = 7; // 这条事务之前发送者所发送的事务数量
     bytes to = 8; // 接收账户地址，或者调用的合约地址，或者`null`如为合约创建
     bytes data = 9; // 数据或合约代码
     bytes v = 10; // ECDSA recovery id
@@ -40,9 +40,9 @@ message Block {
     bytes witness = 4; // 见证者账户地址
     uint64 timestamp = 5; // 区块产生时的UNIX时间戳
     uint64 size = 6; // 区块大小的字节数
-    bytes message_root = 7; // 区块的消息树根
-    repeated Message messages = 8; // 消息对象的数组，或为空
-    repeated bytes message_hashes = 9; // 32字节的交易哈希的数组，或为空
+    bytes transactions_root = 7; // 区块的事务树根
+    repeated Transaction transactions = 8; // 事务对象的数组，或为空
+    repeated bytes transaction_hashes = 9; // 32字节的交易哈希的数组，或为空
 }
 
 message BlockNumberRequest {
@@ -64,18 +64,18 @@ message GetBlockByHashRequest {
     bool full_transaction = 3;
 }
 
-message GetMessageByHashRequest {
+message GetTransactionByHashRequest {
     string ledger = 1;
     bytes hash = 2;
 }
 
-message GetMessageByBlockNumberAndIndexRequest {
+message GetTransactionByBlockNumberAndIndexRequest {
     string ledger = 1;
     uint64 block_number = 2;
     uint32 index = 3;
 }
 
-message GetMessageByBlockHashAndIndexRequest {
+message GetTransactionByBlockHashAndIndexRequest {
     string ledger = 1;
     bytes block_hash = 2;
     uint32 index = 3;
diff --git a/bg/api/common.proto b/bdchain/api/common.proto
similarity index 55%
rename from bg/api/common.proto
rename to bdchain/api/common.proto
index efdb38e..e918e1d 100644
--- a/bg/api/common.proto
+++ b/bdchain/api/common.proto
@@ -1,15 +1,16 @@
 syntax = "proto3";
 
-package bg.api;
+package bdchain.api;
 
-option go_package = "bg/api/protobuf/common";
-option java_package = "bg.protobuf";
+option go_package = "bdchain/api/protobuf/common";
+option java_package = "bdchain.protobuf";
 option java_outer_classname = "CommonProto";
 option java_multiple_files = true;
 
-enum MessageType {
+/* 事务类型 */
+enum TransactionType {
     RECORD = 0; // 通用数据记录
-    TRANSACTION = 1; // 交易
+    MESSAGE = 1; // 消息
     CONTRACT_CREATION = 2; // 合约创建
     CONTRACT_INVOCATION = 3; // 合约调用
 }
diff --git a/bg/api/tx_ledger.proto b/bdchain/api/tx_ledger.proto
similarity index 52%
rename from bg/api/tx_ledger.proto
rename to bdchain/api/tx_ledger.proto
index 7f6162f..f3cf6c4 100644
--- a/bg/api/tx_ledger.proto
+++ b/bdchain/api/tx_ledger.proto
@@ -1,19 +1,19 @@
 syntax = "proto3";
 
-package bg.api;
+package bdchain.api;
 
 import "google/protobuf/empty.proto";
-import "bg/api/common.proto";
+import "bdchain/api/common.proto";
 
-option go_package = "bg/api/protobuf/tx_ledger";
-option java_package = "bg.protobuf";
-option java_outer_classname = "TxLedgerProto";
+option go_package = "bdchain/api/protobuf/tx_ledger";
+option java_package = "bdchain.protobuf";
+option java_outer_classname = "TransactionLedgerProto";
 option java_multiple_files = true;
 
-service TxLedger {
+service TransactionLedger {
     rpc CreateLedger (CreateLedgerRequest) returns (CreateLedgerResponse);
     rpc GetLedgers (google.protobuf.Empty) returns (GetLedgersResponse);
-    rpc SendMessage (SendMessageRequest) returns (SendMessageResponse);
+    rpc SendTransaction (SendTransactionRequest) returns (SendTransactionResponse);
 }
 
 message CreateLedgerRequest {
@@ -27,16 +27,16 @@ message GetLedgersResponse {
     repeated string ledgers = 1;
 }
 
-message SendMessageRequest {
+message SendTransactionRequest {
     string ledger = 1;
-    message Message {
-        MessageType type = 1;
+    message Transaction {
+        TransactionType type = 1;
         bytes from = 2;
         bytes to = 3;
         bytes data = 4;
     }
-    Message message = 2;
+    Transaction transaction = 2;
 }
-message SendMessageResponse {
+message SendTransactionResponse {
     bytes hash = 1;
 }
diff --git a/gen.bat b/gen.bat
index dec8950..1d4836f 100644
--- a/gen.bat
+++ b/gen.bat
@@ -1,4 +1,4 @@
-mkdir go
-protoc -I . --go_out=plugins=grpc:go bg/api/common.proto
-protoc -I . --go_out=plugins=grpc:go bg/api/tx_ledger.proto
-protoc -I . --go_out=plugins=grpc:go bg/api/ac_chain.proto
+mkdir gen\go
+protoc -I . --go_out=plugins=grpc:gen/go bdchain/api/common.proto
+protoc -I . --go_out=plugins=grpc:gen/go bdchain/api/tx_ledger.proto
+protoc -I . --go_out=plugins=grpc:gen/go bdchain/api/ac_chain.proto
diff --git a/gen.sh b/gen.sh
index dec8950..88bf8ba 100644
--- a/gen.sh
+++ b/gen.sh
@@ -1,4 +1,5 @@
-mkdir go
-protoc -I . --go_out=plugins=grpc:go bg/api/common.proto
-protoc -I . --go_out=plugins=grpc:go bg/api/tx_ledger.proto
-protoc -I . --go_out=plugins=grpc:go bg/api/ac_chain.proto
+#!/usr/bin/env bash
+mkdir -p gen/go
+protoc -I . --go_out=plugins=grpc:gen/go bdchain/api/common.proto
+protoc -I . --go_out=plugins=grpc:gen/go bdchain/api/tx_ledger.proto
+protoc -I . --go_out=plugins=grpc:gen/go bdchain/api/ac_chain.proto