The model of the vertical cavity surface emitting laser (VCSEL) was established by SIMULINK and the influence of the spontaneous emission factor on the high frequency and large signal modulation response is studied. The result shows when its value varied from 5×10 -3 to 5×10 -5, with the modulation index deepening, the peak photon density will exhibit bifurcation and multi-period, then go back to single period. But if it reduces to 10 -5, the peak photon density will exhibit chaos at last. Furthermore, the position of the bifurcation occurs is depend on the value of spontaneous emission factor. A large spontaneous emission factor can suppress the nonlinear behaviors of VCSEL. The simulation results are agree with the experimental results reported in document.