The electric vehicle power supply technology based on wireless power transfer (EVPS-WPT) has several advantages over conventional energy transmission using wires and connectors, such as flexibility, convenience, safety, reliability and all-weather operation, etc. The development of EVPS-WPT will certainly promote the popularization and industrialization of EVs. The fundamental structure of electric vehicle wireless power supply system based on ICPT (EVPS-ICPT) is described firstly in this paper. A supposed dynamic battery charging system for electric vehicles based on ICPT (EVC-ICPT-D) is proposed to explain some concepts more clearly. The main circuit topology of EVPS-ICPT system is also discussed and selected. As the focus of this paper, the key techniques for EVPS-ICPT system are discussed and analyzed in the round.