The tip/tilt mirror performs controllable high-speed swing to stabilize the imaging beam and compensate for the external micro-vibration for optical telescope. The calculation of surface parameter under dynamic driven frequency is the design foundation of tip/tilt mirror. To resolve the dynamic surface parameter calculation problem, the frequency response analysis of tip/tilt mirror is carried out; the discrete error and elimination method of optical surface for tip/tilt mirror is proposed as well to improve the surface calculation precision of tip/tilt mirror; the optomechanical simulation technology is selected to process the dynamic surface change data of tip/tilt mirror and it has been proved the effectiveness to obtain the dynamic surface parameter of tip/tilt mirror. The calculation results demonstrate the nonlinear change rule between the surface change parameter and the driven frequency; the surface change is not obvious under the lower micro-vibration driven frequency, but is obvious under the higher driven frequency; the microvibration frequency and environmental adaption of tip/tilt mirror are determined based on the dynamic surface parameter simulation results. The research of dynamic surface parameter for frequency response of tip/tilt mirror provides a new technical reference for the dynamic surface simulation and structural design of tip/tilt mirror.