The dynamic test system of highspeed rail track roadbed needs to have characteristics of large vibration force, high frequency, large amplitude and excitation waveform adjustable. In order to truly and effectively simulate its actual working condition, aimed at a new kind of electrohydraulic servo system, controlled with using adaptive model following control theory, the corresponding mathematical model was established and solved in Labview. The result shows that Adaptive Model Following Control is able to get a high precision and accurate output for a given waveform and achieve the required design.