Abstract: Based on the bogie suspension system structure of CRH2 high\|speed EMU, the dynamic models of the train in both vertical and horizontal directions are established. Fuzzy control theory is used to control the rigid body vibration that affects the stability of the vehicle, such as floating, nodding, sideways moving, rolling and shaking head. According to the characteristic requirements of semi\|active control system, the magnetorheological damping system is proposed to replace the original oil damping system, so as to reduce the vibration acceleration in all directions and to improve vehicle body stability. Taking the power spectral density of China trunk railway track as the basis of rail surface excitation, Simulink module in MATLAB is used to carry out whole vehicle performance simulation research. Results show that the semi\|active control suspension system can effectively suppress 5 vibration modes in 2 directions, creating positive impact on improving vehicle operational stability and reducing impact force on the bogie. At the design level, semi-active magnetorheological suspension system can be used to replace the conventional rail vehicle passive control suspension system.