The carbon fiber-reinforced plastics composite components were taken as research object, the experiments of the centring-slots in a hole were carried out by the forming cutters with reduced chisel edge.The effects of the chisel edge size and of the moving route of the cutter on the cutting forces were investigated.The results show that when the chisel edge of the cutters reduces, the cutting forces tends to decrease,but the trend of the degression of the cutting forces become slow when the chisel edge is reduced to 0.5 mm.The processing scheme is of short single tooth processing time,low cutting forces, and excellent processing quality,which is one time feeding to finish a slot using the forming cutters with 0.5 mm chisel edge. It is a reasonable processing scheme.