Abstract: In the course of pulsed eddy current nondestructive testing(NDT), in order to study the disciplinarian of testing results influenced by the variation of sensor space position, induction voltage of the detecting coil and distributions of electromagnetic fields near defect, influenced by the level and upright variations of sensor space position, are analyzed using ANSYS finite element simulation method. Simulating results proved that when the sensor lies in different level or upright detecting positions, the edge of defects can be detected through the detecting positions at the peaks of induction voltage in the first situation, and the signals of induction voltage intersect at a point in the other. Simulating results provide theoretical guidance for studying testing results influenced by variations of sensor space position on experimentation.