To the best of the authors' knowledge, there is a vacancy of straightforward, reliable relations describing transport phenomena, especially in a tapered parallel flow field PEMFC. In this study, the resistance against oxygen transport and water saturation is selected as objectives to examine transport phenomena in the PEMFC. Two functions are presented for them, which are valuable for comprehensive studies about the cell's behaviour. Pressure, temperature, stoichiometries of both sides, and the porosity of GDL are selected as the most significant factors affecting water management and