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The parameters that describe the complex degree of a certain casting are of some uncertainty.Therefore,a new method based on the fuzzy theory to classify the complex degree of castings has been presented in this paper.The feasibility of fuzzy theory in describing the complex degree of castings has been discussed and the procedure of this method has been specified by analyzing the complex degrees of some typical castings.The element factors that influence the casting complexity,have been summarized,which include the wall-thickness and the number of transition surface,etc.The results show that it is reasonable and practicable to classify the complex degree of castings with the fuzzy theory.