In　order　to　overcome　the　inconvenience　due　to　shortage　of　patterns,　materials,　colors　and　so　on　in　traditional　commerce,　a　model　of　fitting　system　was　built　based　on　UML　by　using　Object-oriented　analysis　method　in　this　paper.　And　the　simulation　system　was　practically　programmed　and　the　effect　of　simulated　fitting　finally　was　achieved.　The　results　show　that　with　the　modeling　it　is　legible　for　the　flow　and　is　effective　in　programming.