Abstract: Milling experiments were carried out on unidirectional and bidirectional laminates of T300/5222A carbon fiber reinforced epoxy resin composite with coated cemented carbide tool. The effects of fiber orientation as well as milling speed, feed per tooth and milling width on the milling surface quality were studied. The results show that with the increase of the angle between fiber orientation and workpiece feed direction, the burr on milling surface of the unidirectional laminate became more and more serious, and even the chipping appeared. With the increase of the milling speed, milling width and feed per tooth, the amount of the protruding fibers and holes formed by fiber pull-out on milling surface of the bidirectional laminate increased, and the height difference between peaks and troughs was also improved. The difference between the two-dimensional surface roughness and three-dimensional surface roughness was large. Using three-dimensional surface roughness can more accurately evaluate the milling surface topography of carbon fiber composites. The three-dimensional surface roughness of the bidirectional laminate increased with the increase of the milling speed, feed per tooth and milling width, and the influence of the milling speed and feed per tooth was relatively significant.