Abstract: Considering the engine’s foundation excitation and nonlinear oil film force, the dynamic model of turbocharger rotor-bearing system is established, and the nonlinear dynamic behavior of eccentricity is investigated. The response is simulated by numerical calculation. The bifurcation disciplinarian of nonlinear rotor dynamics with different rotational speeds under foundation excitation is studied, and the influences of foundation excitation are evaluated. The result shows that foundation excitation will remarkably affect the rotor dynamic behaviors through the nonlinear oil film force, and foundation excitation will lower the rotational speed at which the oil whirl occurs. However, the influences of foundation excitation are more distinct on the low rotational speed stage of rotor than on the high speed stage.