The nonlinear vibration responses of the blisk with two blades were investigated in this paper. The two rotating blades were settled as a springsrotating conical shells system,and the effects of the presetting and pretwisted angles were considered for the model. Using Hamilton's principle, the partial differential governing equation of the motion of blisk was established. Galerkin's approach and numerical method were applied to analyze the nonlinear dynamics of the model. Numerical simulations were performed to investigate the responses of the blades under different rotating speeds and excitations. Numerical studies revealed the effects of the rotating speeds and excitations on the nonlinear vibration of the system.