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By defining the hot zone and hot zone index, corresponds the fault reasoning and diagnosis to equipment structure decomposition, constructs the fault automatic reasoning coding rules in the process of diagnosis, which can convert the fault tree to a series of operational and certain logical code, and to realize visual automatic reasoning and diagnosis. An example for the electronic equipment fault reasoning is presented to illustrate the feasibility and effectiveness of the proposed approach, can achieve equipments’ visual LRU hierarchical fault diagnosis and rapidly position the faults.