The heavy hydrostatic bearing with multiple oil pad is the key part of the heavy CNC equipment due to its advantages of large bearing capacity, low friction coefficient and high working stability and reliability. Meantime, it is known that the performance of the bearing can affect the machining quality and working efficiency of the whole equipment directly. However, with the development of modern industry, the rotating machinery develops towards high speed, high accuracy and large power, resulting in the performance requirements of the bearing in all aspects become higher and higher. Hence, the research on heavy hydrostatic bearing is increasingly prompting to the width and the depth. When the hydrostatic bearing works under the pressure and heat conditions, local distortion would easily occur and the oil film would become thinner. Moreover, when the local oil film under boundary lubrication is in high speed heavy haul, dry friction will be brought out. The oil film will also break out because of the rapid increase at room temperature. Furthermore, the rotating velocity will be restricted by terminological failure. All those above will influence the machining accuracy and the work efficiency of the machine. In a word, deep theoretical research is the key point to improve the machining accuracy and work efficiency and to keep pace with the national mechanics environment developing towards high speed and high accuracy.