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Aiming at some problems of missile weapon control system such as complex structure and difficulty to establish precise mathematical model,adopt fault tree analysis,take the example for the fault that network interface sends normally receive abnormally and weapon control console shows abnormality of power-on check to butt-joint training missile and indicator light of weapon control power supply control panel does not enlighten , detailedly describe fault phenomenon,deeply dissect fault reason, comprehehsively tease fault mechanism,accurately establish fault tree, standardly express fault format.According to the experience of experts, give occurrence rate of fault and incidence to weapon control system,finish fault qualitative and quantitative analysis,efficiently realize localization and elimination,provide complete fault diagnosis case reference that appears during the process of maintenance. Therefore,have some theoretical and practical value,lay firm foundation for system and comprehensive and high pertinent and time sensitive operational application technical support product of follow-up this type missile weapon equipment,comprehensively promote operation and maintenance support ability.