The nonlinear dynamics,bifurcation and chaotic dynamics of a simply supported laminated composite piezoelectric beam were analyzed. The beam was forced by an axial load and a transverse load. Based on the von Karmantype equations and the Reddy thirdorder shear deformation plate theory, the nonlinear equations of motions of the laminated composite piezoelectric beam were derived. The Galerkin’s approach was employed to discretize the partial differential equations to the ordinary differential equations. The method of multiple scales was used to obtain the averaged equations. Based on the averaged equations, the bifurcation and chaotic motions of the beam were studied. The periodic and chaotic motions of the beam were found by using numerical simulation. It is concluded that the chaotic responses are sensitive to the piezoelectric excitations. Through changing the piezoelectric excitation, we can control the oscillation of the laminated composite piezoelectric beam.