The current methods used in the magnetization in non-destructive testing are varied and there are differences in realization and effect.Moreover,the excitation source,detection time,detection location have significant influence on the final test results.Reasonable mode of magnetization is a condition to not only get satisfactory magnetic flux leakage signal,but also facilitate the detection of the signal picking-up.All current modes of magnetization for non-destructive testing were analyzed,compared,includi...