SB-JPALS is the important application of the Joint Precision Approach and Landing System which support the autonomous landing of aircraft. For ensuring the safety of the flight, a series of strategies were conducted to achieve the integrity performance. The article researches the fault mode of the SB-JPALS firstly, based on which the fault monitoring and mitigation method within the architecture design, navigation algorithms and fault monitoring at JPALS reference station were introduced. Finally, the way to solve the fault integrity monitoring based BDS was proposed.