Effects of milling tool rake angles and cutting parameters on surface roughness of medium density fiberboard（MDF）were investigated.The results showed that the surface roughness improved with the increase of rake angles.While the increase of feed per tooth and/or cutting depth resulted in poorer surface roughness.The feed per tooth had the greatest effects on the machined surface,followed by the cutting depth and the rake angles.The optimum cutting condition obtained by range analysis were 12° rake angle,feed per tooth in 0.5 mm and cutting depth in 1 mm.The average surface roughness of the MDF samples was only 3.82 μm.