Abstract: Elaborated in the essay are the two methods for measuring peaking defect of the SAWH pipe, i.e., the vertical axis measurement method and the parallel axis measurement method.The shortcomings of the conventional measurement tools based on these two processes are analyzed, and accordingly, modifications thereof are made.With the modified measurement tools, the conventional qualitative detection has been turned into a quantitative one.As a result, the inspection accuracy has been improved so as to meet the need for detecting peaking defect of the high-standard linepipes.And compared with the vertical axis inspection tools, those for the parallel axis process are more convenient for operation, and more applicable as well.