The deep drawing parameters of cover of water heater are confirmed by repetitious technologic trials traditionally because of complicated surface of the cover top. Higrade simulates and analyzes the blank-holder pressure, draw-bead, blank size of the deep drawing process of the cover of water-heater which they how effect product forming quality using drawing analysis software. With regard to the insufficiency of current process the new improving process is introduced by adopting ring semi-circular draw bead and small size of blank. It can reduce the blank-holder pressure obviously, improve the formability of deep drawing part and product quality, it also can improve the utilized rate of sheet metal blank materials.