diff --git a/pkg/runner/trpc.go b/pkg/runner/trpc.go
index b93b09ee..b1cb214f 100644
--- a/pkg/runner/trpc.go
+++ b/pkg/runner/trpc.go
@@ -25,6 +25,7 @@ import (
 	"encoding/json"
 	"fmt"
 	"os"
+	"strings"
 	"time"
 
 	"github.com/linuxsuren/api-testing/pkg/testing"
@@ -83,8 +84,8 @@ func (r *tRPCTestCaseRunner) RunTestCase(testcase *testing.TestCase, dataContext
 
 	r.log.Info("start to send request to %s\n", testcase.Request.API)
 
-	var fd *descriptor.FileDescriptor
-	fd, md, err := getTRPCMethodDescriptor(r.proto, testcase)
+	var service string
+	service, md, err := getTRPCMethodDescriptor(r.proto, testcase)
 	if err != nil {
 		if err == protoregistry.NotFound {
 			return nil, fmt.Errorf("API %q is not found", testcase.Request.API)
@@ -96,7 +97,7 @@ func (r *tRPCTestCaseRunner) RunTestCase(testcase *testing.TestCase, dataContext
 	}
 
 	payload := testcase.Request.Body
-	resp, err := invokeTRPCRequest(ctx, r.cc, fd, md, payload, r.host)
+	resp, err := invokeTRPCRequest(ctx, r.cc, service, md, payload, r.host)
 	if err != nil {
 		return nil, err
 	}
@@ -120,7 +121,7 @@ func (r *tRPCTestCaseRunner) GetResponseRecord() SimpleResponse {
 	return r.response
 }
 
-func getTRPCMethodDescriptor(proto testing.RPCDesc, testcase *testing.TestCase) (fd *descriptor.FileDescriptor, d *descriptor.RPCDescriptor, err error) {
+func getTRPCMethodDescriptor(proto testing.RPCDesc, testcase *testing.TestCase) (service string, d *descriptor.RPCDescriptor, err error) {
 	opts := []parser.Option{
 		parser.WithAliasOn(false),
 		parser.WithAPPName(""),
@@ -146,22 +147,38 @@ func getTRPCMethodDescriptor(proto testing.RPCDesc, testcase *testing.TestCase)
 		proto.ProtoFile = tempF.Name()
 	}
 
+	var fd *descriptor.FileDescriptor
+	var method string
+	service, method = splitServiceAndMethod(testcase.Request.API)
 	if fd, err = parser.Parse(
 		proto.ProtoFile,
 		[]string{},
 		0,
 		opts...,
 	); err == nil {
-		d = fd.Services[0].MethodRPC[testcase.Request.API]
+		for _, svc := range fd.Services {
+			if svc.Name == service {
+				d = svc.MethodRPC[method]
+				break
+			}
+		}
+	}
+	return
+}
+
+func splitServiceAndMethod(api string) (service, method string) {
+	parts := strings.Split(api, "/")
+	if len(parts) >= 2 {
+		service = parts[len(parts)-2]
+		method = parts[len(parts)-1]
 	}
 	return
 }
 
-func invokeTRPCRequest(ctx context.Context, cc client.Client, fd *descriptor.FileDescriptor, md *descriptor.RPCDescriptor, payload string, host string) (
+func invokeTRPCRequest(ctx context.Context, cc client.Client, serviceName string, md *descriptor.RPCDescriptor, payload string, host string) (
 	resp map[string]string, err error) {
 	ctx, msg := codec.WithCloneMessage(ctx)
 	defer codec.PutBackMessage(msg)
-	serviceName := fd.Services[0].Name
 
 	msg.WithClientRPCName(fmt.Sprintf("/%s.%s/%s", md.RequestTypePkgDirective, serviceName, md.Name))
 	msg.WithCalleeServiceName(md.RequestTypePkgDirective + "." + serviceName)
diff --git a/pkg/runner/trpc_test.go b/pkg/runner/trpc_test.go
index f05d751f..22b196e8 100644
--- a/pkg/runner/trpc_test.go
+++ b/pkg/runner/trpc_test.go
@@ -41,7 +41,7 @@ func TestTRPC(t *testing.T) {
 		testcase := &atest.TestCase{
 			Name: "Unary",
 			Request: atest.Request{
-				API:  "Unary",
+				API:  "/Main/Unary",
 				Body: "{}",
 			},
 		}
@@ -54,7 +54,7 @@ func TestTRPC(t *testing.T) {
 		_, err := tRPCRunner.RunTestCase(&atest.TestCase{
 			Name: "Fake",
 			Request: atest.Request{
-				API:  "Fake",
+				API:  "/Main/Fake",
 				Body: "{}",
 			},
 		}, nil, context.Background())