Abstract: In this article resonant second-harmonic generation accompanying SH type plate waves in an isotropic plate has been studied theoretically.The result shows that one of second-order driving waves retains the effect of cumulative growth along the boundary of the plate,once the phase velocities of SH type plate waves equal the longitudinal one of elastic medium of plate.Second-order cumulative waves have been fully determined by applying the boundary condition of second-order stress.Although second-order plane-waves can not be entirely fixed in the present analysis,the cumulative waves accompanying SH type plate waves are of substantial significance in practical application.