Abstract: In order to further study the movement characteristics of vibration flip-flow screen, the paper consider the rotation of the screen frame around the centroid, establish a linear six-degree-of-freedom dynamic model of vibration flip-flow screen and solved the steady solution of the differential equation of motion. Analysis the Motion Trajectory of flip-flow screen by using State Space and Calculus Module. Combined with the design example, calculate the centroid displacement and rotation angle of the active screen frame and the floating screen frame of the vibration flip-flow screen. And according to the motion equations of any point on the screen frame, simulated the motion track of the special point on the sieve frame. The results shows that the rotation of the screen frame around the centroid has a great influence on the amplitude of the input and the outlet, so the influence of the rotation should be considered in the modeling. The paper provides theoretical basis for further research and product design.