An integrated navigation fault-tolerance algorithm based on One-Class Support Vector Machine (OCSVM) is proposed.In the integrated navigation system,the failure of a subsystem will affect the accuracy of the whole navigation system.To solve the problem,the method based on OCSVM is adopted to detect and isolate the fault,and the fault-tolerance performance is analyzed.The simulation results show that,after applying the OCSVM based fault-tolerance algorithm,the fault detection module of the system can effectively isolate fault data,thereby reducing the position error of the multi-source integrated navigation system,and its reliability and stability are also improved.