Abstract: Thin multilayer stainless steel sheet and metal bellows specimens with artificial defect were manufactured, and the testing ability and technical characteristics of eddy current array testing were studied. The results showed that the eddy current array testing technology can effectively detect the surface and internal linear defects of thin multilayer stainless steel sheet and metal bellows. The amplitude and phase of defect signals were related to the depth of defect burial, and the depth of defect burial can be comprehensively judged by the amplitude and phase.