The control objective and several key parameters of PEMFC（proton exchange membrane fuel cell）hybrid system were analyzed.Control strategy design and energy optimization simulation were made individually for a given cycle and real time operation.For the given cycle case，genetic algorithm was adopted to solve the multi-constraint combinatorial optimization problem.The simulation result showed the algorithm’s feasibility.As far as the real time operation was concerned，based on the original fuzzy control strategy，the fuel cell voltage and voltage variance parameters were introduced to apply two-level modification on the fuzzy control output.The result revealed that the improved fuzzy control strategy could enhance fuel cell efficiency and reduce power fluctuations.