This　paper　challenges　the　difficult　problem　of　building　accurate　virtual　medical　models.　We　design　an　efficient　system　and　method　to　modify　existing　three　dimensional　(3D)　human　medical　models　to　obtain　more　accurate　ones　for　different　persons　in　real　time.　Our　presented　system　can　be　constructed　as　a　linear　system,　and　this　linear　system　can　be　solved　by　computer　in　real　time.