Aiming at the complex signals of pulsed eddy current sensor for ferromagnetic materials, a detection model of pulsed eddy current rectangular sensor based on finite element is established. This paper proposes that there are pulsed eddy current detection area and pulsed magnetic flux leakage detection area in pulsed eddy current rectangular sensor. The simulation analysis of pulsed electromagnetic detection is carried out. The best detection position of the angles between the defect and the axis of the rectangular probe is studied. Both simulation and experiment results show that the effective detection area of the pulsed eddy current of the rectangular probe is the border area under the probe, and the effective detection area of the pulsed magnetic flux leakage detection is the area under the center of the rectangular coil. The best detecting point of pulsed eddy current is the position at the angle of 10° between the defect and the axis of the rectangular probe, and the best detecting point of pulse magnetic flux leakage is the position at the angle of 70° between the defect and the axis of the rectangular probe.