The designed system is a multi-point home security system, which uses the micro-controller AT89S52 as the core. The system mainly realizes the detection alarms of the multi-point home security based on the star networking of sensors, including position detection alarms and type detection alarms. The system also can display real-time time(Normal situation), alarm type and alarm time (when alarming)by LCD. The system would realize remote control and alarm by using RF wireless.