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The aerodynamic load simulator is the essential equipment in the hardware-in-the-loop simulation system. It is mainly used to simulate the aerodynamic load on the rudder surface of the aircraft, and then to test the control performance of the control system under the influence of the load. Aircraft generally has strong maneuverability and the corresponding aerodynamic load spectrum has a wide range of amplitudes and changes very quickly. So, the control performance of aerodynamic simulator is required to be very high. The real-time requirements generally reach microsecond level, which puts forward high requirements for software design. There are many measurement and control channels in the simulator system, and the working conditions are various. So the software structure is complex, and it needs to be designed in detail for the working conditions of the simulator. This paper analyses the control requirements of a typical aerodynamic simulator, builds the software structure and designs a general control software.