To generate greener environment, the alternative sources are necessary. In alternative sources, less emission energy sources are needed to control the emission and fossil fuel depletions. Proton exchange membrane fuel cells have the benefit of zero emission, quick start up, easy implementation, long lifetime and low operating temperature. Performance of PEM fuel cell is depending upon the various operating parameters and geometrical parameters. The performance is mainly caused by the geometrical parameters such as flow field, flow channel, catalyst layers. In this paper, the different flow channel cross sectional shape and the effects of the flow channel designs on the performance of proton exchange membrane fuel cell are reviewed. The major performance increment is depending upon the flow channel cross section. Because of the varying cross sectional areas, the fuel is forced on the gas diffusion layer and enhances the chemical reaction that increase the performance of proton exchange membrane fuel cell.