In the process of tube plate testing, the main indexes are the hole position, the aperture tolerance, the aperture in the hole, the burr, the position of the grooves and so on. For the double tube plate, it is more important to pay more attention to the hole position in the testing process. The hole position coordination of the two tubesheet is very important. The general use of numerical control drilling machine can be guaranteed. The perpendicularity of the holes is important compared with the thick plates, more than 300mm, and the large diameter plates require more precise tools and equipment. The application of the special Longmen processing center will become more and more common.