Abstract: In order to solve the problem of serious clogging that the traditional screening equipment has in sieving the moist fine coal,a kind of unilateral driven flip-flow screen (UDFS) was designed. Based on the structure and principle of the UDFS,a dynamic model of the UDFS surface was established,and the effects of the positive and negative tension on the dynamic parameters of the screen surface were studied. Then,the displacement,velocity and acceleration char- acteristics of the mid-surface were plotted using Matlab software,and the influence of tension amount on the dynamic parameters of the screen surface were compared and analyzed. Finally,the transient dynamics analysis of the screen surface with different tensions were carried out using ANSYS Workbench software. In addition,the distribution of dis- placement,velocity and acceleration of the screen surface were studied when the displacement,velocity and accelera- tion of the mid-surface were the largest. The results illustrate that with the increase of tension,the deflection of the screen surface decreases,the velocity and acceleration increase. When the screen surface tension is selected at about 2 mm,the acceleration can reach 50 g,and the screening effect is ideal.