Abstract: The NDT is an industrial and engineering application-oriented scientific field, and hence it must be involved in combining itself closely with the affairs of national economy development and must serve for the large engineering projects and maintain their safety and integrity. In order to realize sustainable development of economy, the energysaving and green manufactures have become the basic policy of national economy development. Under this background, it is of significance and very high interest to promote green NDT techniques. The paper detailed the basic concepts of green NDT and compared existing NDT methods from the point of view of green aspects, and aimed to draw some conclusions for the future development of various NDT means. The paper also discussed the future development trend of NDT techniques, and its final part was, by taking the authors own working experience in AE monitoring of fatigue cracks as an example, to showed the significant role played by NDT technique.