HVAC System is currently used for controlling of vehicle cabin temperature and mode. We are usually using semicenter type HVAC System. But semi-center type HVAC System has more package problem than center mount’g type HVAC System. This being so, when developing a new car, one of the repeated problems is the lack of storage space. In particular, the small size of the glove box is one of the biggest requirements from the consumer. In this study, optimizing center mount’g type HVAC System, could be decreased size, cost and weight. Additionally we could improve N.V.H(Noise, Vibration, Harshness) performance. We used DFSS method and made 18 variations of aspirators by L.I.S rectangular coordinate system. Also CFD analysis tool used FLUENT.