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Considering the effects of geometrically nonlinear and damping, the vibration differential equation of simply supported rectangular orthotropic laminated plate excited by two-term harmonic forces was established.The nondimensional Duffing nonlinear forced vibration equation was deduced by using Galerkin method.The amplitude frequency response equation of system steady motion under combination resonance was obtained by the method of Multiple Scales.Based on Lyapunov stable theory, the critical conditions of steady-state solutions stability were got.By some examples, the influence of different parameters on nonlinear combination resonances and bifurcation properties of system was analyzed.