Abstract: The relationship between membrane water content and operation parameters of the proton exchange membrane fuel cell（PEMFC）was analyzed.A water transport model was developed with engineering approach.The model showed that the membrane water content was increased by humidifying the reaction gas.However,overly humidified reaction gas led to flooding of the diffusion layer.So，the reaction gas flow of the cathode was regulated to resolve the flooding problem.Consequently，in order to assure a high membrane water content and low flooding of the cathode diffusion layer,a control model was built for the membrane water content based on the neural networks to achieve water management of the PEMFC.