This paper deals with some problems of an aerostatic guide for saw-blade, such as the characteristic of velocity distribution of air flow between the guide block and saw blade, the calculation methods for the mass flux of compressible air flow and the conditions of continuous and steady air flow etc. The results of analysis prove that the vibration damping and stabilized guidance of saw-blade can be realized by using the aerostatic guide, which can improve stability of band saw-blade.