The Unmanned Undersea Vehicle (UUV) using batteries as its power had to go back to mother ship or seashore for charging frequently.Aiming at the problem that could not endure a long time in underwater navigation

a new energy system

i.e.closed loop circulation fuel cell system

was proposed and designed

which can prolong the underwater navigation time while the displacement of UUV remained unchanged.Based on chemistry and thermodynamic fluid characteristics of Proton Exchange Membrane Fuel Cells(PEMFC)

mathematical model for closed loop circulation fuel cell system was established. The main influence factors for output voltage was analyzed

and a new control strategy by mixing PB arithmetic and fuzzy rules was designed， which allowed to control the power matching of UUV propulsion system.Simulation results show that the new control strategy can meet power demand of UUV

and provide the foundation for development of a experiment system.