The main principle of the fuel cell system is that taking external supply of hydrogen and air (for oxygen used) as reactant, electric power is generated by electrochemical reaction between the two on the membrane electrode in the engine, and the only emission is pure water. It can be said that fuel cell system are the ultimate energy and power solutions. Snowman SFH series fuel cell system applications include automobiles, metro, unmanned aerial vehicles, distributed energy, and backup power with the advantages of long life, high efficiency, high reliability and so on. Compared with internal combustion engines or lithium- electric vehicles, fuel- cell system vehicles have unparalleled advantages such as long mileage, fast charging, zero pollution, and zero emissions.