Video　Monitor　System　has　now　been　widely　applied　in　various　fields,　Moving　Object　Detecting　and　Tracking　are　both　an　important　part　of　Video　Monitor　System　and　key　technology　of　Intelligence　Video　Monitor　System.　So　how　to　track　moving　object　steady,　real-time　and　effectual　becomes　an　important　question　that　needs　to　be　paid　attention　and　researched.　Based　on　the　inter-frame　difference　and　background　subtraction　method　of　comparison,　the　dissertation　chooses　a　single　Gaussian　background　model　method　for　Moving　Object　detection　of　the　video　stream　captured　by　network　cameras,　and　then　using　the　Meanshift　arithmetic　for　moving　object　tracking.　All　of　the　above　algorithms　are　encapsulated　by　Applet,　so　that　can　be　used　flexibility　in　web　projects.　At　the　same　time　an　alarm　module　is　added　in　the　system　to　achieve　SMS　alarm　function　when　the　module　is　turned　on.　©　2011　IEEE.