Abstract: Addressing the increasingly huge demand for hi-speed flux leakage steel pipe detecting equipment,the coauthors,based on the working principle and method for such equipment,point out and analyze the critical techniques related to the hi-speed flux leakage detection process. With the critical techniques as identified,the first hi-speed flux leakage steel pipe detection system in the country has been developed,which is operating with the pipe rotating spirally,and at a detecting speed up to 2.8 m/s,having resulted in inspection target values conforming to the most stringent NDT requirements as specified under applicable API specification,and brought about satisfactory operation effectiveness.