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The mass transport properties of fuel cells mainly determined by the flow field structure. Therefore, it is an effective method to improve the running condition and performance of the cell by improving the flow field structure. In this paper, a modified serpentine channel with gradient channel depth and trapezoidal section shape is proposed. The new flow field and the traditional serpentine flow field are solved numerically, the numerical results reveals that compared with the other one the new flow field have a more uniform concentration of reactants, and the water generation in the reflection area is lower due to the high channel pressure. Through the optimizing the flow field the fuel cell have a 23% performance improvement.