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The article aimed at mold parts surface machining, has been studied high speed wire cutting technology. Explored the process evaluation factors which impact wire cutting mold based on the theoretical analysis of the wire cutting discharge gap and the surface processing finish of the mold parts. By studying the two main elements which affect the mold parts surface roughness processing, measures of improve and enhance wire cutting mold surface roughness are proposed. Only the comprehensive account of various factors can obtain mould parts processing good surface quality. The research methods and conclusion have provided reference on solving the problem of mold parts surface roughness by WEDM.