Smart home solutions integrate the electronic products in the home (door locks, TVs, lamps, refrigerators...) Connected by wireless network for centralized control. By selecting millimeter wave radar, life will be fully taken over by the intelligent housekeeper. Users only need to open an app in their mobile phone, they can remotely control it anytime and anywhere, and let it help them do various things, such as turning on the air conditioner, playing music, cleaning the room, closing the door and turning off the lights. In this scheme, a millimeter wave radar system can be optionally installed in the room to detect the position and movement track of indoor personnel in a non-contact manner. It can count the number and activity posture of indoor personnel, track the track, detect the physiological data of respiration and heartbeat, and then generate corresponding switching operations.