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Space passive hydrogen maser has been applied on Chinas BeiDou Navigation Satellite System.Its long-term reliability and lifetime in orbit are significant topics needed to be verified.The repair methods are limited if space passive hydrogen maser breaks down in orbit.So it is necessary to simulate the on-board situation on ground for verification on the reliability and lifetime of space passive hydrogen maser.The major distinction between space environment and ground environment is their gaseous pressure.It is vacuum in orbit when it is atmospheric pressure on ground.Creating vacuum condition with vacuum container for space passive hydrogen maser,Shanghai Astronomical Observatory is verifying the long-term reliability and lifetime of space passive hydrogen maser.The performance and status data are acquired and analyzed after a period of testing.It indicates that the space passive hydrogen maser maintains excellent frequency performance during the testing period.