Ionic Polymer Metal Composites (IPMCs) are a group of electroactive polymer materials that exhibit a large deformation due to the application of low voltages resulting from the movement of cations inside the polymer. These materials have many applications in various fields such as Micro-robotics, biomedical engineering equipment and artificial muscles. Due to the possibility of producing these materials in micro dimensions they can also be used in micro-electromechanical systems. On the other hand, due to their sensitivity to very low voltages, they can be a good substitute for silicon in micro-electromechanical systems. In the present study, the dynamical analysis of a micro-beam fixed at two ends made of these materials is investigated using electrical-chemical-mechanical relations. COMSOL Multiphysics software is used to solve the relations. The results showed that for harmonic stimulation (sinusoidal voltage) the system experiences only the same form of the first mode. It was also observed that increasing the frequency would decrease the amplitude of the micro-beam oscillation.