diff --git a/common/cmd/cmd.go b/common/cmd/cmd.go
index 93b7d7b1f..188783677 100644
--- a/common/cmd/cmd.go
+++ b/common/cmd/cmd.go
@@ -31,6 +31,8 @@ type Cmd struct {
 
 	checkFuncs cmap.ConcurrentMap //map[string]checkFunc
 
+	// open log flag.
+	openLog bool
 	// error channel
 	ErrChan chan error
 }
@@ -64,7 +66,7 @@ func (c *Cmd) runCmd() {
 
 // RunCmd parallel running when parallel is true.
 func (c *Cmd) RunCmd(parallel bool) {
-	fmt.Println("cmd: ", c.args)
+	fmt.Println("cmd:", c.args)
 	if parallel {
 		go c.runCmd()
 	} else {
@@ -72,12 +74,17 @@ func (c *Cmd) RunCmd(parallel bool) {
 	}
 }
 
+// OpenLog open cmd log by this api.
+func (c *Cmd) OpenLog(open bool) {
+	c.openLog = open
+}
+
 func (c *Cmd) Write(data []byte) (int, error) {
 	out := string(data)
-	if verbose {
-		fmt.Printf("%s: %v", c.name, out)
+	if verbose || c.openLog {
+		fmt.Printf("%s:\n\t%v", c.name, out)
 	} else if strings.Contains(out, "error") || strings.Contains(out, "warning") {
-		fmt.Printf("%s: %v", c.name, out)
+		fmt.Printf("%s:\n\t%v", c.name, out)
 	}
 	go c.checkFuncs.IterCb(func(_ string, value interface{}) {
 		check := value.(checkFunc)
diff --git a/tests/integration-test/common.go b/tests/integration-test/common.go
index 3663eaba6..71f069cf4 100644
--- a/tests/integration-test/common.go
+++ b/tests/integration-test/common.go
@@ -78,6 +78,7 @@ func free(t *testing.T) {
 }
 
 type appAPI interface {
+	OpenLog(open bool)
 	WaitResult(t *testing.T, timeout time.Duration, keyword string) bool
 	RunApp(waitResult func() bool)
 	WaitExit()
@@ -86,33 +87,44 @@ type appAPI interface {
 
 func runMsgRelayerApp(t *testing.T, args ...string) appAPI {
 	args = append(args, "--log.debug", "--config", bridgeFile)
-	return cmd.NewCmd("message-relayer-test", args...)
+	app := cmd.NewCmd("message-relayer-test", args...)
+	app.OpenLog(true)
+	return app
 }
 
 func runGasOracleApp(t *testing.T, args ...string) appAPI {
 	args = append(args, "--log.debug", "--config", bridgeFile)
-	return cmd.NewCmd("gas-oracle-test", args...)
+	app := cmd.NewCmd("gas-oracle-test", args...)
+	app.OpenLog(true)
+	return app
 }
 
 func runRollupRelayerApp(t *testing.T, args ...string) appAPI {
 	args = append(args, "--log.debug", "--config", bridgeFile)
-	return cmd.NewCmd("rollup-relayer-test", args...)
+	app := cmd.NewCmd("rollup-relayer-test", args...)
+	app.OpenLog(true)
+	return app
 }
 
 func runEventWatcherApp(t *testing.T, args ...string) appAPI {
 	args = append(args, "--log.debug", "--config", bridgeFile)
-	return cmd.NewCmd("event-watcher-test", args...)
+	app := cmd.NewCmd("event-watcher-test", args...)
+	app.OpenLog(true)
+	return app
 }
 
 func runCoordinatorApp(t *testing.T, args ...string) appAPI {
 	args = append(args, "--log.debug", "--config", coordinatorFile, "--ws", "--ws.port", strconv.Itoa(int(wsPort)))
 	// start process
-	return cmd.NewCmd("coordinator-test", args...)
+	app := cmd.NewCmd("coordinator-test", args...)
+	app.OpenLog(true)
+	return app
 }
 
 func runDBCliApp(t *testing.T, option, keyword string) {
 	args := []string{option, "--config", dbFile}
 	app := cmd.NewCmd("db_cli-test", args...)
+	app.OpenLog(true)
 	defer app.WaitExit()
 
 	// Wait expect result.
@@ -122,7 +134,9 @@ func runDBCliApp(t *testing.T, option, keyword string) {
 
 func runRollerApp(t *testing.T, args ...string) appAPI {
 	args = append(args, "--log.debug", "--config", rollerFile)
-	return cmd.NewCmd("roller-test", args...)
+	app := cmd.NewCmd("roller-test", args...)
+	app.OpenLog(true)
+	return app
 }
 
 func runSender(t *testing.T, endpoint string) *sender.Sender {