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Based on Internet and using artificial intelligence techniques to guild remote fault diagnosis expert system can provide expert-level fault diagnosis service for remote devices. Based on the introduction of general structure and related key techniques of fault diagnosis system, the expert system was introduced into fault diagnosis system in this paper. The architecture of an open fault diagnosis expert system was brought out. A practical knowledge database update model was analyzed and designed. The working principle and process of the system were also designed and explored, which lays good foundation for the construction of practical and reliable Internet-based remote fault diagnosis expert system.