Pulsed remote field eddy current (PRFEC) technique integrates the advantages of richness frequency components of pulsed eddy current testing and remote field technique adapt to inspect ferromagnetic pipeline, which is used for detecting axial crack in pipelines. In this paper the principle of PRFEC is analyzed, four sensor models of different structures are designed, the detection effects of pipeline by four sensor models are simulated, the distance of transition field and the detection sensitivity for axial crack and the detection result of pipelines of various wall thicknesses are studied. The result of simulation shows that the model with the core connected through the exciting coil has the better testing ability.