People＇s　demand　for　location　information　increase　sharply,　and　people　begin　the　research　on　the　technology　of　vision　location.　In　order　to　achieve　of　the　result　of　exact　and　quick　positioning,　describe　indoor　position　algorithm　on　block　match　of　image　sequence.　First,　initialize　the　image　sequence,　and　then　define　search　area,　compute　the　MAD,　return　the　coordinates　of　image,　transform　the　coordinates,　at　last,　get　the　change　of　two　images.　Experimental　results　show　that　the　mobile　track　by　algorithm　can　represent　the　actual　path　approximately.　©　2010　IEEE.