The fuction of vehicle air vent is both flow adjust and block of air, ventilation and dehumidification by discharging air through HVAC unit and duct on crash pad. A claim study about air vent V.O.C(voice of customer) indicates that knob breakaway and noise between knob bar and wing are important quality problems. This paper will propose a new structure which can control direction of air without knob bar and wing rod for improving chronic quality problem by using TRIZ methodology.