diff --git a/cmd/install.go b/cmd/install.go
index 24715fa..d027474 100644
--- a/cmd/install.go
+++ b/cmd/install.go
@@ -2,6 +2,7 @@ package cmd
 
 import (
 	"github.com/qiniu/goc/v2/pkg/build"
+	"github.com/qiniu/goc/v2/pkg/config"
 	"github.com/spf13/cobra"
 )
 
@@ -13,6 +14,8 @@ var installCmd = &cobra.Command{
 }
 
 func init() {
+	installCmd.Flags().StringVarP(&config.GocConfig.Mode, "mode", "", "count", "coverage mode: set, count, atomic, watch")
+	installCmd.Flags().StringVarP(&config.GocConfig.Host, "host", "", "127.0.0.1:7777", "specify the host of the goc sever")
 	rootCmd.AddCommand(installCmd)
 }
 
diff --git a/cmd/watch.go b/cmd/watch.go
new file mode 100644
index 0000000..427e88b
--- /dev/null
+++ b/cmd/watch.go
@@ -0,0 +1,25 @@
+package cmd
+
+import (
+	"github.com/qiniu/goc/v2/pkg/config"
+	cli "github.com/qiniu/goc/v2/pkg/watch"
+	"github.com/spf13/cobra"
+)
+
+var watchCmd = &cobra.Command{
+	Use:     "watch",
+	Short:   "watch for profile's real time update",
+	Long:    "watch for profile's real time update",
+	Example: "",
+
+	Run: watch,
+}
+
+func init() {
+	watchCmd.Flags().StringVarP(&config.GocConfig.Host, "host", "", "127.0.0.1:7777", "specify the host of the goc server")
+	rootCmd.AddCommand(watchCmd)
+}
+
+func watch(cmd *cobra.Command, args []string) {
+	cli.Watch()
+}
diff --git a/pkg/watch/watch.go b/pkg/watch/watch.go
new file mode 100644
index 0000000..4177260
--- /dev/null
+++ b/pkg/watch/watch.go
@@ -0,0 +1,27 @@
+package watch
+
+import (
+	"fmt"
+
+	"github.com/gorilla/websocket"
+	"github.com/qiniu/goc/v2/pkg/config"
+	"github.com/qiniu/goc/v2/pkg/log"
+)
+
+func Watch() {
+	watchUrl := fmt.Sprintf("ws://%v/v2/cover/ws/watch", config.GocConfig.Host)
+	c, _, err := websocket.DefaultDialer.Dial(watchUrl, nil)
+	if err != nil {
+		log.Fatalf("cannot connect to goc server: %v", err)
+	}
+	defer c.Close()
+
+	for {
+		_, message, err := c.ReadMessage()
+		if err != nil {
+			log.Fatalf("cannot read message: %v", err)
+		}
+
+		log.Infof("profile update: %v", string(message))
+	}
+}