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This research is aimed at the development of computer-aided polishing technology for optical surfaces using magnetorheological (MR) fluid as medium.The mechanism of a dual-axis polishing wheel and the mathematical model combined with a symmetrical tool function are demonstrated.The effects of speed,gap,time and geometric parameters of the tool have been experimentally evaluated by polishing a parabolic BK7 mirror in 120mm diameter.The surface topography presented an obvious amelioration,and the shape accuracy decreased to 0.067λ from 0.519λ(λ=632.8nm,RMS) after 75min finishing.