3、;12AbstractWiththedevelopmentofsociety and theimprovementofpeople'slivingstandards, ruralurbanization andpersonnelmobity,socialsecuritysituationhasbecomeincreasinglycomplex,theincreasinglyseriouscrimeofthefthashighlightedtheyoungerage,groupcrimeandcrimecharacteristicssuchashighquality,peo
4、ple’ssafetyawarenessisalsogrowing.Suchasfamily, school, factory, office andotherplaces should improvethe anti-theft systemitselfifthedetectedsomeonebrokein,thenthesystemwillsendoutalarmsoundandlightalarmcircuitsoundstothepeopletoremind.ThesystembasedonsinglechipAT89S52seriesasthecore,usin