diff --git a/test/bdchain/api/README.md b/test/bdchain/api/README.md
index e69de29..140a7b5 100644
--- a/test/bdchain/api/README.md
+++ b/test/bdchain/api/README.md
@@ -0,0 +1,21 @@
+# API 测试工具
+
+## Go 版本测试服务器 `mockserver`
+
+### 编译
+
+1. 准备好 Go 环境
+2. 下载 [BDChain Go SDK](https://phabricator.internetapi.cn/source/bdchain/repository/master/) 到 `GOPATH`
+3. 切换工作目录到 `mockserver` 目录
+4. 使用 `go get -d ./...` 安装此项目依赖
+5. 使用 `go build` 编译
+6. `mockserver` 即为编译好的可执行程序
+
+### 运行
+
+- 使用 `.\mockserver --help` 查看使用帮助
+- 目前仅支持使用 `--port N` 设定程序运行的端口为 N
+
+### 测试连接
+
+在需要测试连接的位置，设定连接地址和端口为此 `mockserver` 所在地址及端口即可。
diff --git a/test/bdchain/api/mockserver/.gitignore b/test/bdchain/api/mockserver/.gitignore
new file mode 100644
index 0000000..5188726
--- /dev/null
+++ b/test/bdchain/api/mockserver/.gitignore
@@ -0,0 +1,6 @@
+# Go
+debug
+debug.test
+
+mockserver
+mockserver.exe
diff --git a/test/bdchain/api/mockserver/errors.go b/test/bdchain/api/mockserver/errors.go
new file mode 100644
index 0000000..134915c
--- /dev/null
+++ b/test/bdchain/api/mockserver/errors.go
@@ -0,0 +1,52 @@
+package main
+
+import (
+	"github.com/pkg/errors"
+	"google.golang.org/grpc/codes"
+	"google.golang.org/grpc/status"
+)
+
+// Errors
+var (
+	ErrInvalidServer      = errors.New("server is invalid")
+	ErrInvalidRequest     = errors.New("request is invalid")
+	ErrInvalidParameter   = errors.New("parameter is invalid")
+	ErrTestNotImplemented = errors.New("test path not implemented")
+
+	ErrMultiple  = errors.New("Multiple errors in transaction")
+	ErrEmptyFrom = errors.New("from must not be empty")
+	ErrInvalidTo = errors.New("to must be a valid 32-byte address")
+	ErrEmptyName = errors.New("name must not be empty")
+)
+
+func toStatusError(src error) error {
+	/*__*/ if src == nil {
+		return src
+	} else if _, ok := src.(interface{ GRPCStatus() *status.Status }); ok {
+		return src
+	} else {
+		switch errors.Cause(src) {
+		/////////////////////////////////////////////////////////////////////
+		default:
+			return src
+		case ErrInvalidServer:
+			fallthrough
+		case ErrInvalidRequest:
+			return status.Error(codes.Internal, src.Error())
+		case ErrInvalidParameter:
+			return status.Error(codes.InvalidArgument, src.Error())
+		case ErrTestNotImplemented:
+			return status.Error(codes.Unimplemented, src.Error())
+
+		/////////////////////////////////////////////////////////////////////
+		case ErrEmptyName:
+			fallthrough
+		case ErrEmptyFrom:
+			fallthrough
+		case ErrInvalidTo:
+			return status.Error(codes.InvalidArgument, src.Error())
+		case ErrMultiple:
+			return status.Error(codes.InvalidArgument, src.Error())
+		}
+	}
+}
diff --git a/test/bdchain/api/mockserver/main.go b/test/bdchain/api/mockserver/main.go
new file mode 100644
index 0000000..65689d1
--- /dev/null
+++ b/test/bdchain/api/mockserver/main.go
@@ -0,0 +1,39 @@
+package main
+
+import (
+	"flag"
+	"fmt"
+	"net"
+	"strconv"
+
+	"bdchain/api/grpc/txledger"
+
+	"google.golang.org/grpc"
+)
+
+func main() {
+	// flag
+	port := flag.Int("port", 10000, "set the port of test server")
+	flag.Parse()
+
+	// server
+	rpc := grpc.NewServer()
+	srv := (*grpcServer)(&server{})
+	txledger.RegisterTransactionLedgerServer(rpc, srv)
+
+	con, err := net.Listen("tcp", ":"+strconv.Itoa(*port))
+	if err == nil {
+		fmt.Println("server is running on", *port)
+	} else {
+		fmt.Println(err)
+		return
+	}
+
+	// start
+	err = rpc.Serve(con)
+	if err != nil {
+		fmt.Println("server closed with error", err)
+	} else {
+		fmt.Println("server closed")
+	}
+}
diff --git a/test/bdchain/api/mockserver/server.go b/test/bdchain/api/mockserver/server.go
new file mode 100644
index 0000000..51f0bcb
--- /dev/null
+++ b/test/bdchain/api/mockserver/server.go
@@ -0,0 +1,191 @@
+package main
+
+import (
+	"bytes"
+	"context"
+
+	"google.golang.org/grpc/codes"
+	"google.golang.org/grpc/status"
+
+	"bdchain/api/grpc/common"
+	"bdchain/api/grpc/txledger"
+
+	"github.com/golang/protobuf/proto"
+	"github.com/golang/protobuf/ptypes/empty"
+)
+
+/////////////////////////////////////////////////////////////////////////////
+// server
+type server struct{}
+
+/////////////////////////////////////////////////////////////////////////////
+// grpcServer
+type grpcServer server
+
+func (s *grpcServer) ClientVersion(
+	c context.Context,
+	r *empty.Empty,
+) (res *common.ClientVersionResponse, err error) {
+	switch {
+	case s == nil:
+		err = toStatusError(ErrInvalidServer)
+	case r == nil:
+		err = toStatusError(ErrInvalidRequest)
+	default:
+		res = &common.ClientVersionResponse{
+			Version: "TxLedgerGo/v0.0.1alpha/darwin/go1.11",
+		}
+	}
+	return
+}
+
+func (s *grpcServer) CreateLedger(
+	c context.Context,
+	r *txledger.CreateLedgerRequest,
+) (res *txledger.CreateLedgerResponse, err error) {
+	switch {
+	case s == nil:
+		err = toStatusError(ErrInvalidServer)
+	case r == nil:
+		err = toStatusError(ErrInvalidRequest)
+	case r.Name == "":
+		err = toStatusError(ErrEmptyName)
+	case r.Name == "test":
+		res = &txledger.CreateLedgerResponse{
+			Ok: true,
+		}
+	default:
+		err = toStatusError(ErrTestNotImplemented)
+	}
+	return
+}
+
+func (s *grpcServer) GetLedgers(
+	c context.Context,
+	r *empty.Empty,
+) (res *txledger.GetLedgersResponse, err error) {
+	switch {
+	case s == nil:
+		err = toStatusError(ErrInvalidServer)
+	case r == nil:
+		err = toStatusError(ErrInvalidRequest)
+	default:
+		res = &txledger.GetLedgersResponse{
+			Ledgers: []string{
+				"first",
+				"second",
+				"third",
+			},
+		}
+	}
+	return
+}
+
+func (s *grpcServer) SendTransaction(
+	c context.Context,
+	r *txledger.SendTransactionRequest,
+) (res *txledger.SendTransactionResponse, err error) {
+	switch {
+	case s == nil:
+		err = toStatusError(ErrInvalidServer)
+	case r == nil:
+		fallthrough
+	case r.Transaction == nil:
+		err = toStatusError(ErrInvalidRequest)
+	case r.Ledger != "test":
+		err = toStatusError(ErrTestNotImplemented)
+	default:
+		type Input struct {
+			Type common.TransactionType
+			From []byte
+			To   []byte
+			Data []byte
+		}
+		type Output struct {
+			Hash  []byte
+			Error error
+		}
+		type Case struct {
+			I Input
+			O Output
+		}
+
+		Merge := func(
+			p *status.Status,
+			cs ...*status.Status,
+		) *status.Status {
+			msg := []proto.Message{}
+			for _, c := range cs {
+				msg = append(msg, c.Proto())
+			}
+			r, err := p.WithDetails(msg...)
+			if err != nil {
+				panic(err)
+			}
+			return r
+		}
+
+		tx := r.Transaction
+		for _, c := range [...]Case{
+			{
+				I: Input{
+					Type: common.TransactionType_MESSAGE,
+					From: []byte{
+						0xf0, 0x0d, 0xca, 0xfe, 0xf0, 0x0d, 0xca, 0xfe,
+						0xf0, 0x0d, 0xca, 0xfe, 0xf0, 0x0d, 0xca, 0xfe,
+						0xf0, 0x0d, 0xca, 0xfe,
+					},
+					To: []byte{
+						0xfe, 0xed, 0xba, 0xbe, 0xfe, 0xed, 0xba, 0xbe,
+						0xfe, 0xed, 0xba, 0xbe, 0xfe, 0xed, 0xba, 0xbe,
+						0xfe, 0xed, 0xba, 0xbe,
+					},
+					Data: []byte{
+						0xde, 0xad, 0xbe, 0xef,
+					},
+				},
+				O: Output{
+					Hash: []byte{
+						0xd1, 0x5e, 0xa5, 0xed, 0xd1, 0x5e, 0xa5, 0xed,
+						0xd1, 0x5e, 0xa5, 0xed, 0xd1, 0x5e, 0xa5, 0xed,
+						0xd1, 0x5e, 0xa5, 0xed, 0xd1, 0x5e, 0xa5, 0xed,
+						0xd1, 0x5e, 0xa5, 0xed, 0xd1, 0x5e, 0xa5, 0xed,
+					},
+					Error: nil,
+				},
+			},
+			{
+				I: Input{
+					Type: common.TransactionType_MESSAGE,
+					From: nil,
+					To: []byte{
+						0x50, 0xba, 0xda, 0x55,
+					},
+					Data: nil,
+				},
+				O: Output{
+					Hash: nil,
+					Error: Merge(
+						status.New(codes.InvalidArgument, ErrMultiple.Error()),
+						status.New(codes.InvalidArgument, ErrEmptyFrom.Error()),
+						status.New(codes.InvalidArgument, ErrInvalidTo.Error()),
+					).Err(),
+				},
+			},
+		} {
+			if c.I.Type == tx.Type &&
+				bytes.Equal(c.I.From, tx.From) &&
+				bytes.Equal(c.I.To, tx.To) &&
+				bytes.Equal(c.I.Data, tx.Data) {
+				if c.O.Error != nil {
+					err = c.O.Error
+				} else {
+					res = &txledger.SendTransactionResponse{Hash: c.O.Hash}
+				}
+				return
+			}
+		}
+		err = toStatusError(ErrTestNotImplemented)
+	}
+	return
+}