In order to diagnose the fault, the fault of the unnormal automatic shift function of tracked vehicle is diagnosed by the FTA-FMEA method, according to the step of determine the top event, FTA(Fault Tree Analysis) qualitative analysis, self-checking and self-repairing by the user unit, FMEA(Failure Mode and Effects Analysis) analysis and locate the fault. The conclusion of the study can be conveniently guiding self-repairing by the user unit or repairing by the next higher level repair unit. Practice has proved, this method is simple and feasible, with high accuracy, has very important significance to guide the tracked vehicle repair.

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