diff --git a/interface/example1/sensor/sensor.go b/interface/example1/sensor/sensor.go
new file mode 100644
index 0000000..9d8da97
--- /dev/null
+++ b/interface/example1/sensor/sensor.go
@@ -0,0 +1,12 @@
+package sensor
+
+type Sensor interface {
+	Add()
+	Delete()
+	Update()
+	Search()
+}
+
+func AddSensor(s Sensor) {
+	s.Add()
+}
diff --git a/interface/example1/sensor/sensorimpl/ftp.go b/interface/example1/sensor/sensorimpl/ftp.go
new file mode 100644
index 0000000..5e05e26
--- /dev/null
+++ b/interface/example1/sensor/sensorimpl/ftp.go
@@ -0,0 +1,30 @@
+package sensorimpl
+
+import (
+	"fmt"
+	"golanglearn/interface/example1/sensor"
+)
+
+type Ftp struct {
+	Name string
+}
+
+func (f *Ftp) Add() {
+	fmt.Println("ftp sensor", f.Name)
+}
+
+func (f *Ftp) Delete() {
+	panic("implement me")
+}
+
+func (f *Ftp) Update() {
+	panic("implement me")
+}
+
+func (f *Ftp) Search() {
+	panic("implement me")
+}
+
+func NewFtp(name string) sensor.Sensor {
+	return &Ftp{Name: name}
+}
diff --git a/interface/example1/sensor/sensorimpl/rtsp.go b/interface/example1/sensor/sensorimpl/rtsp.go
new file mode 100644
index 0000000..0200bf0
--- /dev/null
+++ b/interface/example1/sensor/sensorimpl/rtsp.go
@@ -0,0 +1,30 @@
+package sensorimpl
+
+import (
+	"fmt"
+	"golanglearn/interface/example1/sensor"
+)
+
+type Rtsp struct {
+	Name string
+}
+
+func (r *Rtsp) Add() {
+	fmt.Println("add sensor", r.Name)
+}
+
+func (r *Rtsp) Delete() {
+	panic("implement me")
+}
+
+func (r *Rtsp) Update() {
+	panic("implement me")
+}
+
+func (r *Rtsp) Search() {
+	panic("implement me")
+}
+
+func NewRtsp(name string) sensor.Sensor {
+	return &Rtsp{Name: name}
+}
diff --git a/interface/main.go b/interface/main.go
new file mode 100644
index 0000000..233afff
--- /dev/null
+++ b/interface/main.go
@@ -0,0 +1,13 @@
+package main
+
+import (
+	"golanglearn/interface/example1/sensor"
+	"golanglearn/interface/example1/sensor/sensorimpl"
+)
+
+func main() {
+	rtsp1 := sensorimpl.NewRtsp("xxx")
+	sensor.AddSensor(rtsp1)
+	ftp1 := sensorimpl.NewFtp("ftp")
+	sensor.AddSensor(ftp1)
+}