This paper demonstrates human weight perception fbr sudden weight changes during a l 而 ng proccss ． ［ t iswell known that human motion has an unimodal velocity protlle including the acceleration and deceleration zones in a rcaching task ， which has a start and the goal points 、 This study attempts to reveal the difference of human weight porceptions between two zoncs by giving some magnitUdes ofweight changes with a force display device ； especially ， we investigate the difference threshold ( DL ； Diffcrenz Limcn ) in thc wcight pcrccption ， Thc results show that human weigh perception tends to become more sensitive in tlle deceleration zone ， Further ， this paper g ． hows thc cffectiveness ofvirtual real 重 ty teclmologies tbr physical experiments ．