Abstract: Vibrating Flip-flow screen is an effective means to solve the problem of viscous and wet fine particle screening, and its dynamic structure has an impact on the stability of vibration response and screening effect. In order to study the dynamic structural characteristics of the vibrating relaxation screen, this paper takes the 0827 circular vibrating relaxation screen as the research object. Firstly, the rigid-flexible coupling model of the vibrating Flip-flow screen is established.The finite element method is used to calculate the prestressed modal of the screen, and the first eleven-order modal parameters are obtained. According to the calculated modal parameters, the sampling frequency setting and other factors in the experimental test are determined, and then the force hammer method is used for the experiment to obtain the experimental modal parameters of the screen.The results show that the working frequency of the vibrating Flip-flow screen is reasonable. The comparison of the two modal analysis results proves that the theoretical analysis and the experimental analysis are basically the same, indicating the rationality and reliability of the finite element method. This research provides a basis for the analysis and optimization of large-scale vibrating relaxation screens using this kind of finite element method, and at the same time, structural improvement measures are proposed for the analysis results to improve the performance of the screen.