An electrical servo loading test-bed for the actuator was designed based on the AC servo motor,which met the requirements of electromechanical actuator(EMA) loading,and various problems might arose in EMA which was tested under loading of approximately true working environment in test-bed.There were some merits such as analyzing whole structure and working principle of the electrical loading system,introducing various anti-emi measures,establishing mathematical model of motor and torque sensor,and also giving static and dynamic performance testing results from loading test-bed.The test result shows that the loading test-bed can meet design requirements.