In order to approach the real pole-force and pedaling-force extremely, improve the control performance of a certain type of military flight simulator. Mathematical model of elevator control system and electric power servo system model were built. Analysis the structure and work theory of real helicopter. The centralized processing sub-system distribution parameters and getting the equivalent linear model by the least square parameter estimation. Take elevator system and elevator angle model an example, pole-force shift model and rudder angle shift mathematical model was built up and analysis the control mechanism. The model is successfully applied to a certain type of flight simulator control loading system. In the Matlab/simulink environment, the simulation results show that the established system model and the actual system are consistent on static and dynamic response, and prove the validity of the equivalent low-level model.