Abstract: Introduced in the essay are the technique of profiling，and the internal/external profiling of a complex bevel.Based on the design of the cutting parameters and the geometry of cutting tools，1 set of internal profiling device and 2 sets of external profiling devices are installed on the chamfering machine of the JCO steel tube production line.A complex bevel of a 48 mm WT steel tube is cut by the combination of internal & external profiling，3 profiling wheels and 4 chamfering cutters.The analysis leads to a conclusion that for a complex bevel，the method of chamfering with following-up profiling should be adopted；and with the appropriate cutting parameters and cutting tool geometry，the cutting force will be reduced and the complex bevel for a heavy WT tube will be realized by internal & external profiling multi-cutter joint cutting.