Aiming at studying the key problems of vehicle chassis tuning,the roll center height and its migration were designed and checked taking certain type of commercial vehicle as an investigated object.Based on the feature of high roll center of commercial vehicle,the relationship betmeen the suspension roll center height and the suspension elastic element tuning range was explained.It was made clear how to define the suspension elastic element tuning range in acoordance with the comfort requirement and the anti-roll equation,so as to evaluate the tuning availability on the primary design stage,and avoid the possibility of dissatisfaction of chassis performance.The tuning method provided in the paper has important guiding significance and engineering application value to improve the overall performance of commercial vehicle.