Abstract: The chaotic characteristic of nonlinear metal rubber vibration isolation system was studied in this paper. The mechanical model of the system was derived. The static and dynamic tests of the metal rubber isolator were done, and the parameters of the isolator were identified. According to the bifurcation diagrams which changed with the parameters of the excitation, the force and frequency which could make the system be in the chaotic state were got. The displacement time history curve, phase diagram, Poincaré map and frequency spectrogram were structured with the numerical result of Runge-Kutta method, and the maximal Lyapunov exponent was calculated. The chaotic characteristic of the system was simulated and validated by the ADAMS software. Results show that the nonlinear metal rubber vibration isolation system possesses the chaotic characteristics.