The low frequency vibration of flexible appendage of the satellite is easy to be coupled with the whole satellite, and affect the attitude control effect and imaging performance of the satellite. In this paper, a new type of fluid damper is designed, which can quickly stabilize the low frequency vibration of the flexible appendage by connecting the fluid damper in series between the flexible appendage and the satellite. The specific structural model of the damper are established, and the damping characteristics of the fluid damper are studied by using the finite element analysis method. The variation of damping coefficient with orifice diameter, orifice length and excitation frequency is obtained. The result shows that under low frequency excitation，the damping coefficient decreases with the increase of excitation frequency. The damping coefficient increases first and then decreases with the increase of the diameter and length of the damping hole. The result in this paper can provide useful design reference for the application of this kind of damper in engineering practice.