Abstract: Based on the theory of fuzzy mathematics, a model of fuzzy decision expert system is presented. The model is suitable for establishing the expert systems that dispose the single-target decision problems with uncertainty and fuzziness. And based on the model, the expert systems can be built up easily. According to the model, a fuzzy decision expert system is established for planning the deep-drawing schemes of cone parts. It is proved that the model is simple, effective and practical. To solve the concrete problems in constructing fuzzy decision expert systems, the rule match, fuzzy predicate calculus, knowledge representation and problem solving mode of the model are mainly described in this paper.

Key words: expert system, knowledge representation, fuzzy decision