Abstract: In order to study the movement of the main frame and floating frame during the work of flip-flow screen, the paper assumes that the real movement of the vibrating flip-flow screen is include translation and rotation movement, the paper ignored damping effect and increased rotation effect and established a mechanical model of the vibrating flip-flow screen, this paper also found analytical solutions by solving vibration differential equations, and calculated the equation of motion of any position in the vibratory flip-flow screen, major analysis the laws of movement and the motion track of feature points. Experiments were carried out to test the motion track of the feature points of the FFS2461 flip-flow screen. Compared the level of fitting between the motion track calculated by theoretical method and the actual motion track. Find the maximum value of the measured amplitude of the measured point and the relative error of the maximum value of the amplitude obtained by considering the rotation method. This paper briefly discusses the reasons for the deviation between the theoretical trajectory and the measured trajectory. The correctness of the hypothesis is verified, and this model can be used to calculate the trajectory and to guide the engineering practice.