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Integrity is the key navigation performance requirement of civil aviation Performance Based Navigation (PBN) operation and an important support for navigation safety. SINS information is added to tightly integrated BeiDou Navigation Satellite System(BDS)/ Strapdown Inertial Navigation System(SINS) monitoring function, increases redundant information which makes outage satellite detection and exclusion more effective. Using multi-hypothesis separate solution algorithm, the tight coupled BDS/SINS navigation system would provide more reliable integrity information which helps to meet the high integrity requirements in specific flight phases. We used BDS satellites’ data received by BDS receiver to test and verify the integrity algorithm by setting flight trajectory and adding errors to the satellites in this paper. The experimental results show that the BDS/SINS tightly integrated navigation system based on multi-hypothesis separate solution method can detect and exclude outage satellites effectively, and the calculation of protection limit is in line with expectations.