This paper carried out the modal analysis on a cantilever FGM plate with piezoelectric layer covering the surface (P/FGM/P) by using the ANSYS. To define the number of the layers and the height of each layer, the cell sheet Shell99 element model was used. The natural frequency and the modal shape of the cantilever (P/FGM/P) plate were obtained. Through the modal analysis, the first eight modal natural frequencies were given. It is found that there exists the transversal vibration, extensional vibration and torsional vibration in this system, and each modal has different contribution to the total response.