There are several methods for machining different kinds of off-axis parabolic mirrors. A progress based on fine grinding and computer controlled optical surfacing (CCOS) are presented in this article. Machine and grinding principle of fine grinding are introduced,also the error source and choosing the parameters for grinding are analyzed. CCOS for polishing off-axis parabolic mirror and optical testing it with interferometer are briefly introduced. An experiment on a parabolic mirror of 160 mm diameter is carried out and the obtained surface contour is 0.2 μm (perk-to-valley). The results of experiment show that fine grinding combined with CCOS is an effective machining method for off-axis parabolic mirror.