Abstract: The dynamic response of fiber ring resonator has an important effect on the sensing applications. To suppress the dynamic response, the reason of dynamic response was analyzed by the multi -beam interference theory and the critical oscillation conditions of dynamic response were obtained. Furthermore, experiments were designed to analyze the effect of excitation power on the oscillation conditions and the experimental results agreed with the theoretical analysis well. Meanwhile, to avoid of the interference coming from dynamic response, the effect of modulation parameters on the oscillation intensity was made. It provides a reference for the estimation of error in the sensor system.