Jiening's self-developed hydrogen supply system(HSU) adopts the industry's first hydrogen exchange concept to provide an optimized solution for the fuel cell hydrogen supply system. Currently, the system has completed its development and production process, and the first batch of hydrogen exchange heavy trucks have been applied in trucks operating in Wuhai, Inner Mongolia. Jiening's hydrogen supply system for 42/49t heavy-duty trucks adopts 8*210L and 8*220L back-type structure, and can be used for hydrogen refueling and hydrogen exchange, and can be expanded for use in other models.