Variational design is an efficient method for product design; statistics indicates that about 70% of product design is attributed to variational design. It is of vital importance for enterprises to achieve a complex new product through variational design while reusing the previous part model series, which can mostly improve their capability and efficiency of product design and development. Therefore, this paper puts forward an efficient variational design method based on a master model which is automatically generated from a part model series. Using the method, the designers can easily and efficiently create a new part from the master model only through feature selection and parameter modification. In this way, the work of the designers can be greatly alleviated and the design time can be greatly reduced. Experimental results show that the proposed method is effective.

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