By avoiding direct contact between the power supply and train, the contactless power supply technology overcomes the drawbacks effectively of disconnection, contact spark, line wear, lightning interference power, electric shock and other accidents of contact type power supply mode, which meets the requirements about landscape along the route during route planning, and helps to solve the problems of power supply equipment redundancy and security, greatly improving the reliability of the power supply system and providing new ideas and new methods to improve the traditional power supply in the rail transportation field. The principle and the research status of the three major technical solutions at present was briefly analyzed, focused on rail transport sector electromagnetic induction coupling technology, and the existing typical application examples were analyzed in detail, as well as the application feasibility of medium speed maglev power supply was deeply thought.