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Due the misunderstanding of charging standards between charging equipment manufactures and EV manufactures,charging equipment cannot charg to the EV reliably.It designs an AC charging pile control guidance function detection system based an MCGS technology and STM32 embedded software.STM32F103 is used as the lower computer to design the vehicle charging simulation test device,and MCGS configuration is used as upper computer to realize the program writing of charging process monitoring and control strategy. The upper computer and vehicle charging analog detection device adopt RS485 communication mode to realize the action monitoring of connection and confirmation signals and control the guidance signal parameters. Through experimental testing, the detection of new energy vehicle charging control guidance function is realized, which can be applied to detect whether the ac power supply equipment of electric vehicle conforms to GB/T 18487.1-2015, including control and protection device on cable, ac charging pile, non-vehicle-mounted charger, etc.