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Due to guided thought of preventing first and efficient accuracy fault diagnosis for weapon equipment, aim at the deficiency of the fault tree diagnosis method, the production rule and the fuzzy theory were introduced to the fault tree. An fault diagnosis inference method which possesses confirmed and fuzzy capability for the fault tree was designed, the fuzzy fault mechanism was showed as “fault tree”, it can make the fault tree extend from the confirmed diagnosis field to the fuzzy diagnosis field, and relevant diagnosis algorithm was constructed. The result of comparison simulation showed that this inference method not only possesses speediness and veracity, but also can treat with the fuzzy fault mechanism.