Aiming at the requirements of dynamic performance test of servo actuator, giving full play to the advantages of electric loading, such as easy installation and maintenance, flexible control and high dynamic characteristics of linear motor，a scheme of the booster module driven by a linear motor was proposed to realize small displacement，large thrust force and highfrequency dynamic loading program. Based on the mathematic model of the loading system and the servo actuator system, a composite control scheme based on multiloop control and feedforward control was introduced to improve the force loading accuracy, stability and response speed of the system，the feedforward compensation scheme based on the invariance principle was used to restrain the redundant force. The simulation results of MATLAB/Simulink show that the dynamic loading control scheme of servo actuator can effectively improve the dynamic loading performance，restrain the redundant force and has good engineering reference value.