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In order to carry out fault diagnosis of armored vehicle power system correctly, the application of fault tree analysis is studied in depth. Firstly, select a certain type of armored vehicle power system as the research object. According to failure modes and failure mechanism of the armored vehicle power system, FTA is used to armored vehicle power system fault diagnosis. The fault tree is built up and failure analysis exclusion is carried out. And then the simulation of fault diagnosis of four modules of the power system is carried out by the power system fault diagnosis platform. The results show that fault tree analysis can obtain the fault of power system correctly, and the detection accuracy as high as 94%. Anticipative results have been achieved when it was used to armored vehicle power system.