When a vehicle turns at high speeds the body will tilt to the outside of the curve, which will lead to a rollover accident. Aiming at this problem, the active roll control of the vehicle body was studied to improve the steering stability of vehicle. A vehicle dynamic model with six degrees of freedom (DOFs), considering the yaw and roll motions, was established. The desired roll angle of the vehicle was determined and selected as the control objective, and a controller was designed to make the actual roll angle of the vehicle approach the desired roll angle. Under different driving conditions, vehicle body roll angle, dynamic deflection of the suspension, the acceleration perceived by occupants, the lateral load transfer rate, and the power consumption of active suspension for rolling control were investigated. Research results show that the active roll can make the actual roll angle rapidly approach to the desired roll angle, and still make the vehicle have a good driving stability under complex driving conditions; the active roll reduces the peak value of the suspension dynamic deflection, and makes the lateral acceleration perceived by occupants and the lateral load transfer rate quickly approach zero; the power consumption of the active suspension for rolling control is small, which ensures the vehicle has good economic performance.