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As HIL simulation platform for APU Digital Control Systems is bulky and heavy,and difficult to satisfy the controller requirements in outfield test environment,design portable HIL simulation platform.Engine simulation function and flight control simulation and monitoring functions use different computer in a ordinary HIL simulation platform. For portable, using a high-performance portable PXI IPC performs two functions.Designportable signal conditioning boxes, analog sensors and actuators simulation consisting of hardware platform.Use LabWindows / CVI multithreading methods to improve the real-time of software.Use system identification methoddesign APU start-parkmodel,use element-methoddesign steady-state work model.Use the HIL platform to simulation experiment. Experiment results show that the platform has the ability ofthe real-time simulation of theworking mode of APU stably.