For measuring the containment integrated leakage rate effectively,a series of calculation program was developed according to American national standard for containment system leakage test requirements ANSI/ANS-56.8-1994 by Tianwan Nuclear Power Station(TNPS),and this computing program was applied well in the containment system leakage tests for Unit 1 and Unit 2 of TNPS.The detailed calculation process is introduced by this paper to give an example in other containments integrated leakage tests.