In this paper a technique to identify Proton Exchange Membrane Fuel Cell (PEMFC)'s parameters using an optimization approach is proposed. The PEMFC is characterized by technological and empirical parameters and their identification is a hard and time wasting task if is intended to have precise simulation results in a wide range of operating conditions. The Modified Particle Swarm Optimization (MPSO) method is a powerful tool to identify the correct parameter value and used for fast and precise MPSO parameter's identification which is achieved by minimizing the difference between experimental and simulated result.