Abstract: The IR thermography technique as a new kind of non destructive testing technology, had been applied in the field of engineering construction detection and monitoring in initial stage. Taking the detection of a high-rise building exterior finishes construction quality as an example, the application of infrared thermal imaging technology in the detection of building exterior wall was introduced and by combining with other cases, the reliability, sensitivity and detection conditions of the technology were analyzed. The results show that if the external detection condition is well satisfied and the detection time is reasonably selected, the infrared thermal imaging technology can reliably and accurately detect the construction quality of the wall.