T he paper p rop oses a novel d esktop virtu al su rgical sim u lation system cap able of not only su rg ical
training but also op erative plann ing ，su rgery reh earsal an d telesurgery ，w hich is m ainly used on th e rob ot-assis-ted ortho pedic surgery system ，H IT -R A O S ．T he pap er fi rst introduces th e hard w are system ：H IT ．R A 0 S ．T hen presents several m ajor characters of the virtual system ：developing tools，building schem es and collision detection algorithm ．Additionally ．virt ual reality based telesurgery is im plem ented ． B ased on these works experi m en ts of lockin g of intram edu llary nails are con ducted and re sults a re con tent．