Abstract: In boilers, as the design of the header in each county is different, so the production technology is different. When the designed structure is relatively complicated, the use of RT is also limited, therefore, we need to utilize UT and MT to control the mass of the header. Via the theoretical count in this article and observation in actual detection, it can be found using the above-mentioned methods can achieve better detection results. In actual detection process, it is aslo inspected and verified via finding out defects.