In　order　to　render　more　livingly　human　animation,　motion　level　of　detail　method　is　mended　in　this　paper　by　using　an　optimized　process　to　simplify　motion　information.　In　order　to　render　faster,　a　motion　database　is　used　to　reach　real-time　human　animation.　A　prototype　system　is　achieved　and　the　experiments　show　that　the　improved　method　render　more　livingly　and　faster　than　the　original　method　and　other　real-time　methods.