In order to understand the humidification temperature effect on oxygen mass fraction in the cathode for the PEM(Proton Exchange Membrane) fuel cell, a model was set up by three conservation equations, and it was considered the Gravity in source item. The modeling domain consists of the membrane, two catalyst layers, two diffusion layers, and two channels. It is simulation of species mass fraction in this paper. The results of simulation proved that gravity exerts the effect on the water transport when fuel cell is put with anode-upward or cathode-upward. On analyzing of pictures, it got conclusion as follow: Oxygen mass fraction in cathode of fuel cell with cathode-upward is higher than that with anode-upward because of the effect of gravity. Oxygen mass fraction decreases along with channel and thickness of fuel cell due to electrochem reaction consuming, water production in the cathode catalyst layer and the transport of water from the anode side.
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