The sound insulation price of the new Alto car is 2580, and the structural parts are: hood, front fender, four doors, cockpit floor, trunk floor, rear fender, cavities on both sides of trunk and rear tailgate. During construction, except for a layer of special cotton on the cover, all other parts are used: shock absorption, sound insulation, anti-vibration pad, shock absorption, sound insulation and sound absorption cotton, and all other parts are covered except the part with narrow construction space.