This paper introduces a technical scheme of auxiliary power supply system of passenger train based on photovoltaic and energy storage, renewable energy will be injected into the power supply system of train by this system. This paper introduces the technical characteristics, energy consumption level and application situation of Chinese passenger trains, then design a new type auxiliary power supply system of train. It's include details about the structure of auxiliary power supply system, installation methods of photovoltaic panels, MPPT algorithm, the stability control strategy of system, energy management strategy of system. Finally it gives estimation value of the power generation capacity of year, and analyzes the system efficiency, the effect of energy conservation and emissions reduction. This system can be used in any passenger trains, which operating in electrified railway as well as general railway. A new method of power supply system of passenger train and a new application area of photovoltaic technology are designed in the paper.