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This paper studied leakage monitoring, analysed and diagnosed the data on ring sealing surface for pressure equipment in nuclear reactor, using a new type of self-developed steam generator as an object, created the ring sealing surface leakage monitoring system. The effectiveness of the monitoring system is verified by the leakage simulation test conducted by the production of proportional test pieces. For the steam generator, several sealing performance tests such as lifting and cooling cycles and steady-state or transient were carried out, but no leakage was detected during the tests. After test in combination with data of analog real leak, analysed deeply on the monitoring data of steam generator, using data fitting and data distribution two different ways to compare with real leaking data, finally proved ring sealing surface of steam generator without medium leakage, sealed performance is reliable, this monitoring method can be further extended to other pressure equipment of the ring sealing surface leakage monitoring.