Contactless traction power supply system based on inductively coupled power transfer（ICPT）can pro-vide real-time traction power for the train in a contactless power supply mode. It is an important development direc-tion of the new traction power supply technology in the field of rail transit. Firstly

the structure and characteristics ofthe real-time flow-receiving contactless traction power supply system for rail transit are expounded. The domestic andinternational research status of the ICPT technology and contactless traction power supply system for rail transit arereviewed. Then

the research results and existing problems of main key technologies of contactless traction power sup-ply based on ICPT are analyzed in detail. Finally

the current situation of the research on the contactless traction pow-er supply system for rail transit is prospected.