Abstract: Briefed in the essay is the remote field eddy current(RFEC)testing technique.And also discussed are the main aspects of the process,including detecting theoretic model,detection sensor,detection signal processing technique,factors as affecting detection the signal,and application of the detection technology engineering,etc.Moreover the development trend concerning theoretic and applied researches on the(RFEC)technology is pointed out.Adopting the internal passing method,the RFEC process is capable of detecting flaws of small-sized pipelines as in service status,being a very promising non-destructive pipeline detection technique.