So　far,　many　kinds　of　distributed　multimedia　systems　have　been　widely　used　and　multimedia　data,　including　audio　and　video,　are　the　main　data　objects　to　be　transmitted　over　network.　The　characteristics　of　multimedia　data　bring　special　QoS　demand　for　a　distributed　multimedia　system.　In　this　paper,　an　integrated　performance　analysis　model　P　W　for　distributed　multimedia　system　is　proposed.　Based　on　model　PAM,　QoS　evaluation　metrics　for　the　system　is　researched,　and　four　parameters　are　deduced　to　describe　the　performance　of　network,　destination　buffer　and　multimedia　streams.　The　QoS　evaluation　metrics　can　be　used　to　get　a　comprehensive　view　of　the　QoS　for　a　distributed　multimedia　system.