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Geometric modeling method about product which based on computer is the important part in the process of product design. In this paper, we have mainly studied wire frame model design, surface model design and solid modeling design, which are all based on computer. Depending on the advanced modern computer technology, we not only can realize the design, reduce the labor intensity, increase efficiency and improve visual effect, but also lay the foundation for the following analysis, mould design, NC processing. So, we can finish the product model design well.