Abstract: A few of new techniques of electromagnetic testing, such as eddy current testing (single or multi-frequency, pulsed eddy current), alternative magnetic flux leakage and alternative current field measurement, were introduced. Based on their operational principles, the relation and difference of exciting magnetic characteristic (component, wave band, and action zone) were analyzed, as well as measuring magnetic characteristic. Finally, the applications and features of these methods were presented, providing some valuable reference for non-destructive testing practice.