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The more knowledge the expert system possesses, the more competent the system becomes. However the possibility of the occurrence of knowledge conflicts will become greater, and the efficiency of inference will become lower at the same time, which restricts capacity of the knowledge system. The problem oriented analysis and decision expert system(POADES) refers to the human thinking processes and methods, organizes the knowledge revolving around problems, infers according to the human dominating manner, is navigated by hierarchical query tree and all kinds of filters. So it avoids the knowledge conflicts and can be used to construct large capacity knowledge system.