Abstract: In order to resolve the side tumbling of heavy vehicle, the active control method of the side tumbling based on the model forecast was advised. The side tumbling trend of the vehicle was forecasted by the vehicle roll model. The active control real-time of the vehicle side tumbling could be ensured. Combining the working characteristic of the air spring, the active control strategy was designed to actively control the side tumbling of a large bus by air suspension. The experiment was executed when vehicle speed was 80 km/h and steering wheel angle was 200°, rigidity of the left air suspension raised by 12.9%, and the rigidity of the right air suspension decreased by 13.7%, the roll angle was stable at 3.9°. Results show that the roll stability control ability of the heavy vehicle is improved，and the side tumbling crash is decreased.