Mixed power system composed with the three power units of fuel cell, power battery and super capacitor for hydrogen fuel cell tramcar was designed, and the control method for the driving mode and brake mode was researched. In the driving mode, based on DC-bus voltage control, power units were switched in with the sequence of fuel cell, power battery and super capacitor to satisfied the vehicle driving power requirement; in the brake mode, regenerated energy was absorbed by super capacitor and power battery sequentially. The power matching problem of fuel cell and combined energy-storage system double-mode operation was settled, which realized the vehicle max design speed and improved the economy. With the test, the operation conditions, hydrogen consumption and fuel cell power variation were analyzed, and the mixed power structure and control method were validated.