In this article, through building the mechanic model of throttle-slice, the deformation of throttle-slice is studied, the formula and coefficient of elastic throttle-slice bending deformation created, could be used to calculate the bending deformation accurately. Through the study on the superposition throttle-slices thickness, the equivalent thickness formula is obtained. The maximal stress on the superposition throttle-slices was discussed, the relationship between the maximal stress on the superposition throttle-slice and the maximal stress on a piece of throttle-slice with equivalent thickness was investigated, and the coefficients of tress and thickness were obtained. With the equivalent thickness formula and the coefficients of strees, the thickness design of superposition throttle-slices was studied, the design rule was given. With the coefficients of thickness, the stress of superposition throttle-slices was studied and simulated. At last, the damping characteristics of dampers with single throttle slice of designed thckness and muti-slices were tested. The results of test and simulation show that the design rules and the methods of superposition throttle-slices are feasible and effective.