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The application and new development trend of metal additive manufacture technique were introduced, as well as the characteristic and NDT difficulty of metal additive manufacture products. The research progress of NDT was analyzed in emphasis, including the classification of metal additive manufacture technique, the characteristics of defect and microstructure, the influence of defects on mechanical properties, the latest development of NDT methods and standards. Based on that, the key issues that will be focused were summarized at last, that is the application of new NDT methods, on-line monitoring technology, numerical simulation, measurement and characterization of stress, as well as the establishment and development of NDT standards.