Abstract: As a new inspection method, infrared non-destructive testing (IRT) technology can detect the internal defects of materials and components, evaluate the stress state of materials and achieve rapid prediction of fatigue life, and monitor the operating status and diagnose faults of equipment. This article briefly describes the basic principles of IRT technology, and elaborates the research and application status of IRT technology at home and abroad from the aspects of defect detection, stress detection, fatigue analysis, image processing, and testing and monitoring application. The relevant testing equipment and testing standards, applications of the testing technology at home and abroad were introduced and its development trend was also pointed out.