Abstract: Due to the fact that using the potential testing method for aircraft engine turbine disk mortise teeth cracks of ten resulted in the defect being undetected and possibly causing, the accident of turbine disk prolapsed, the possibility of using eddy current testing detecting the crack in aircraft engine turbine disk mortise teeth was outlined. The sensibility was compared between eddy current testing and potential testing methods. Finally the experiments confirmed that eddy current testing method had advantages of high sensitivity, corrosion defects detecting ability, the ease of surface pre-clean-up and quick scanning speed, so it was a detection method worthwile promoting.