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In order to satisfy the requirement of detecting the distortion parameters for the unmanned aerial vehicle(UAV), the distortion test system of unmanned aerial vehicle power system based on Labwindows/CVI is designed in this paper. According to the requirement of the practical equipment, the portable character and the modular design idea has been adopted in the design. At the same time, the technology of hardware filter and software filter is adopted. It is shown that the test system can acquire the distortion parameters and the distortion spectrum of the power system for the unmanned aerial vehicle, and the test results reach to the design requirements, and can satisfy the distortion parameters test requirement for the unmanned aerial vehicle. 