Aimed　at　the　defects　of　security　monitoring　system　in　intelligent　building　with　complicated　design,　higher　production　cost,　uneasy　to　installation,　and　not　suitable　for　ordinary　family,　this　paper　combined　with　the　development　needs　of　intelligent　building,　and　designed　a　remote　network　security　monitoring　system　based　on　Internet,　used　AT91SAM9260　as　the　main　controller　and　used　embedded　technology,　Internet　technology,　video　compression/decompression　technology　and　so　on.　So　that　users　can　detect　the　illegal　intrusion　and　fire　hazards　at　home　in　real-time,　through　computers　or　mobile　phones.　Then　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.　It　can　meet　the　needs　of　security　monitoring　for　an　ordinary　home.