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Abstract As an important part of aircraft attitude control, flight attitude control system impacts on aircraft takeoff and landing and air attitude adjustment. In order to quickly establish the numerical calculation model of hydraulic actuation system, pilot control and control unit, rudder and landing gear demonstration unit, and other experimental physical links, a semi physical simulation experimental platform of flight attitude control system of an aircraft is designed and developed based on the special software for hydraulic design and Simulation of automation studio. The overall software scheme, hardware composition, working principle, development , and experimental flow of the semi -physical simulation platform of a flight attitude control system are given. Finally, taking the aircraft rudder as an example, the numerical calculation model including a hydraulic oil tank, hydraulic motor, control valve, actuator and pipeline, overflow valve, limit switch and other devices, the digital PID regulator of hydraulic valve position, combined with the PLC control program of the rudder surface and its loading demonstration system, and combined with the actual control action of field personnel, the semi-physical simulation experiment of the rudder hydraulic actuation follow-up control system is carried out, The operating conditions in the position follow-up process of aircraft wing hydraulic actuator system are tested and analyzed, and the key experimental data curves are recorded, which provides an intuitive simulation and analysis experimental method for the research of flight attitude control system.