Hydrostatic bearing has many advantages, such as high accuracy of movement, low power consumption of friction, small deflection of bearing center, high capacity of load-carrying, powerful absorption of vibration and long life of operation, etc. But gcx>d static performance can fully be displayed only under good dynamic performance of hydrostatic bearing. The moving and rotating accuracy are determined by its static performance and working conditions are decided by its dogmatic performance. According to mechanic balance and flow continuity, the transfer function of hydrostatic bearing system is established in this paper. On the basis of this transfer function, the new formulas of dynamic performances, namely the formulas of system stability, dynamic stiffness, nature frequency, maximum amplitude are derived. The bearing clearance of hydrostatic bearing with new variable, restrictor can be controlled in constant or near constant. But the clearance of hydrostatic bearing with constant restrictor may be changed into little clearance at the loading on it. Therefore, there are many differences between their dynamic characteristics.