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Considering the local head loss, the frictional head loss, rod padding effect and throttle orifice flow effect, shock absorber throttle formula after the valve opening were analyzed. Three contact types between valve disc and spring seat were investigated, which were circumference line contact, circumference surface contact with entirely hydraulic pressure subjection, and circumference surface contact with partially hydraulic pressure subjection. Corresponding valve disc deformation calculations were established based on the theory of shells and the finite element. The test of damping force vs velocity characteristic was finished, and the curve of pressure vs velocity characteristic at throttle was obtained. It verified the rationality of the transient fluid-structure interaction simulation (FSI). The distribution and the history of the valve disc deformation and the fluid field gained from FSI simulations coincided with Java numerical simulation from theoretic method.