Due to the oil depletion as well as air pollution, new and renewable energies are a highly considered subject in studies and experiments of few recent decades. Among various renewable energy sources, are most noticed due to led environmental pollution and high efficiency. Clearly, the optimal performance of the system depends on the type of the applied controller. This study reviews control techniques used for fuel cell systems. The results of applying different controllers on the system are studied then better control techniques are introduced. The problems involved in fuel cell systems as well as the advantages and disadvantages of different applied control techniques are specified.