<p>Aiming at the nonlinear vibration problem of the shaft-blade coupled rotor system with ball bearings in aeroengines, this paper innovatively adopts the substructure modal synthesis method to construct a coupled dynamic model with the shaft as the main body and the blade as the branch, and introduces the nonlinear Hertz contact model of the ball bearing, breaking through the limitation of traditional overall modeling in depicting the nonlinear behavior at the coupling interface. The nonlinear dynamic response of the system is solved by the Newmark-β numerical algorithm, and the reliability of the model is ensured by combining with the finite element software and experimental verification. The influence laws of rotational speed, bearing parameters and structural dimensions on the vibration characteristics of the system are discovered, and the results can provide a basis for the design of aeroengines.</p>