Aluminum is a non-ferrous metal material which has excellent comprehensive performance. It has been widely used in many sectors. In this paper, plane abrasive machining is carried out for the aluminum. The quality of the Al specimen’s surface is compared after the semi-fixed and loose abrasive processing. The experiment proved that semi-fixed abrasive machining is better than loose abrasive in reducing surface roughness of Al-blocks. In the semi-fixed abrasive machining, the surface roughness of Al-block continued to drop and become stable after 40 minutes. It can prevent deep scratches on Al-blocks’ surface effectively and can get a mirror effect. The surface roughness can reach to Ra 22nm, Rmax 490nm, Rv 130nm. Its removal efficiency is also higher than loose abrasive machining. It is proved that semi-fixed abrasive machining can take the place of rough polishing processing.