Abstract: The complexity and expansibility of cost information are the key problem of the researches on cost modeling in the field of product design. Based on gene engineering，the conception of cost gene model is provided，and cost information functions including information heredity，information copy，information transcrible，information translation studied carefully based on gene function，the questions on information complexity of cost modeling are resolved well，product cost intellectualized modeling is realized successfully. According to this research，a relative software called product cost gene modeling platform (PCGMP) is developed and proved by the example of an excavator boom，the efficiency，reliability and flexibility of product cost modeling are realized compared with formerly researches. The software CGMS has a good commercial foreground as a tool for cost decision supporting system which is provided for product designers.

Key words: Cost model, Gene engineering, Gene model, Numeral and knowledge, Product design