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Abstract. Belonging to a "973" National Science Research Plan of China, the upper limb rehabilitation medical robot design project, this paper research summarizes some main characteristics of a CAID (Computer Aid Industrial Design)design process, and mainly focuses on exploration of key technologies which transform Alias surface model into real entity model through UG, including researches of certain associated Alias surface parameters, as well as the qualitative variables relationships between Alias surface continuity level and its surface parameters.