The large-scale product has a big cylinder and the pressure-bearing capacity is also high. In the sealing test,the water is filled in it to have the pressure test. But due to the over high pressure,the experiment tends to destroy the cylinder and the cover to cause the failure of the sealing and the waste of the cylinder and water. So this paper is to analyze how to add the small combined cylinder within the product cylinder. The water is filled be-tween the small cylinder and the product cylinder and the pressure on the cover is reduced during the sealing ex-periment.%大型产品筒体内径大、承压高，密封试验时需要在筒体注水进行压力密封试验，但是由于压力过大，试验易损坏产品筒体和密封端盖，使得密封效果失效，造成产品筒体和水资源浪费。通过在产品筒体内增加系列组合小筒体，在内置小筒体与产品筒体间注水进行压力密封试验，降低了对密封端盖的压力，满足了试验要求。
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