Abstract: The rationality and stability of the vibrating flip-flow screen have a great influence on its
screening performance and processing capability.In this paper , we established a mechanical model to reflect itsvibration characteristics based on the theory ofdouble - body damping linear vibration. Through mathematical and dynamic analysis , the main dynamic paramelers such as ; damping ratiogg,eccentricily mass moment M,, shear stiffness ha,,and mass ratio pu (mass ratio of floating screen frame and main screen frame) on the amplitude-frequency characteristics of the operating point are verified through tests.The results show that the damping ratio has negligible influence on the relative amplitude in the frequency domain , and the mass ratio u~0.3 is appropriate , which could not increase the mass of the vibrating flip-flow screen, but also reduce the impact of the material on the vibration system.Adjusted shear stiffness could make the working condition in the stable frequency domain; Increasing or decreasing the eccentricity mass moment can increase or decrease the relative amplitude linearly.The method of first regulating u, then adjusting h2, , and finally increasing or decreasing M, is proposed to ensure that the industrial flip-flow screen is located in a stable frequency domain when a reasonable relative amplitude is achieved.This improves the theoretical and technical support of the vibrating flip-flow screen.