Electric load simulator, which can simulate aerodynamic loads acting on aircraft rudder, is an important equipment in hardware-in-loop simulation. A kind of double-loop motor driven load simulator with rapid response is introduced in this paper. The mathematical model of the load simulator is established and is verified by the comparison of simulation curve and experimental curve. It is indicated that the double-loop load simulator restrains the disturbance torque effectively, and can reach the frequency band at 40Hz with steering gear perturbation under simulation circumstances. The research provides an implementation with higher frequency and better compatibility for electric load simulator.