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The construction of knowledge-based rapid response design system for the key parts and components of machine tool is proposed. According to the functional requirements of KBE system, overall framework of rapid design system is constructed based on the UG and Teamcenter Engineering software. Reasoning mechanism combining case-based and rule-based reasoning is put forward to build the knowledge base to improve the search efficiency, and the nearest neighbor method is used to achieve the intelligent retrieval of product design examples. Based on the UG knowledge fusion technology, the product parameterized model library is created and integrated with the design knowledge directly.