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The characteristics of aircraft power system are direct related to utilization equipment operation and fly safety. In 2006, The International Standard Organization (ISO) issued new standard ISO1540-2006 “Characteristics of aircraft electrical system”. According to the requirements of the standard, this paper puts forward a useful method to measure Steady-state Characteristics and Transient Characteristics of aircraft electrical power system. This paper founds the mathematic measuring modals; the virtual instrument technology has been adopted to design hardware measuring platform, include adjustable power factor and digital programming large loads and computer data acquisition system. Measuring software is designed based on LabVIEW. In order to satisfy measuring transient characteristics and the accuracy of measurement NI high speed and high accurate data acquisition card is used; the relative high measuring accuracy has been reached ,the total error of measurement is lower than 0.5%,in measuring transient characteristics, the response time of load contractor is took into account. This system can be used to check onboard constant frequency electrical power system whether or not meet the requirements of international standards, to ensure flight safety.