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Because of the popularization of electric vehicles, the commercial DC charging piles are required to be more adaptable to this situation. According to the GB/T 27930 standard, a DC charging pile detection system for electric vehicles is designed. On the basis of the analysis of the measuring requirement, the overall structure of the system is laid out; the hardware module, equipment configuration and software function module of the system are all explained in detail. Finally a monitoring and controlling software interface of central computer is developed by Visual Basic 6.0. This system is simple, easy to operate, on the basis of testing the communication compatibility; it can mainly be used to detect charging pile status parameters, so it has a wide application prospect.