Abstract: Integrating photovoltaic power generation technology into urban rail transit power supply system can not only save energy and reduce emission, but also reduce the operation cost of urban rail transit lines. The application status of domestic urban rail transit photovoltaic power generation system is introduced. Urban rail transit photovoltaic grid\|connected scheme and topology structure are analyzed, and the technical problems faced after grid connection are pointed out. Future research trends and key focuses are conceived and suggestions are put forward.