Electric vehicle charging mode 2 belongs to the AC slow charging mode,which can connect to traditional home sockets and vehicles for easy carrying and flexible use.Charging mode 2 must be equipped with In-Cable Control and Protection Device(IC-CPD)to ensure charging security.Therefore,before the IC-CPD is issued,it must be tested to meet the conditions of safe use.Based on the importance of IC-CPD testing,the main functions and internal structures of the IC-CPD were analyzed;the design and development of an electric vehicle charging mode 2 guidance process,CP signal testing,and auxiliary charging network relay off test IC-CPD testing device;also gives the hardware circuit design of the testing de-vice and the process of testing with the IC-CPD.