Security　monitoring　system　is　the　important　content　of　safety　management　in　intelligent　building.　This　paper　aimed　at　the　defects　of　security　monitoring　system　in　intelligent　building,　and　used　embedded　technology,　Internet　technology,　video　compression/decompression　technology,　sensors　technology　to　design　a　security　monitoring　system　based　on　Internet.　Users　can　detect　the　illegal　intrusion　and　fire　hazards　indoors　in　real-time,　through　computers　or　mobile　phones.　The　validity　and　efficiency　of　the　system　was　validated　via　test-experiment.　The　results　show　that　this　system　has　several　merits　such　as　good　safety,　good　generality,　simple　operation,　easy　maintenance,　low　cost　and　so　on.　As　an　indispensable　part　of　digital　home,　this　system　has　extremely　important　realistic　meanings　to　the　future＇s　construction　and　development　for　intelligent　building.　Copyright　©　2013　IFSA.