Abstract: Since the peak value of the induced voltage of the detection coil and the zero-crossing time point are too close in the detection of a small diameter pipeline defect, the detection resolution will be reduced. Therefore, this paper presents an improved pulsed far field eddy current testing technology. The pulse signals of different frequencies are applied to the excitation coils at both ends. At this time, the signal of the middle detection coil shows a very high peak. Different defects have different extremely high peaks and correspond to each other, and the degree of defect of the pipeline can be determined through extremely high peaks. This article uses the finite element software ANSYS Maxwell modeling simulation analysis, shows that this method can initially realize the defect type and the defect degree judgment.