Shot　classification　is　helpful　for　video　analysis,　in　this　paper,　an　algorithm　is　proposed.　First,　key　frames　are　extracted　in　equal　interval　in　a　shot;　then　for　a　frame,　Dominant　Colors　are　obtained　by　Hue　histogram,　furthermore,　the　variance　of　Dominant　Colors　and　Ratio　of　clustered　colors　are　computed,　by　which　the　corresponding　frame　could　be　classified　into　playing　or　non-playing　frame;　finally,　a　shot　could　be　classified　by　the　percentage　by　which　key　frames　are　playing　frames.　Experimental　results　confirm　the　efficiency　of　proposed　algorithm.　©　2006　IEEE.