Abstract: Industrial boiler is very dangerous because of its working under high pressure and some parts being heated by fire or high temperature fume. The nondestructive testing(NDT) technique plays one of the most effective roles to ensure the boiler manufacturing quality and its safety. The NDT methods and purpose are discussed during the manufacturing, equipping and using. In addition to normal NDT methods, some advanced techniques such as X-ray real-time imaging and eddy current inspection are also introduced.