The concept and definition of digital manufacturing are propose d in th is paper．And the related basic theories are investigated in detail．A hierarchi cal structure of digital manufacturing is presented to describe a typical produc t development system．Moreover，the modeling methods about environment，process and information are emphasized and the related modeling tools are introduced．Th e development trend of digital manufacturing is also mentioned in this paper．%给出了数字制造的基本概念与定 义；从 数字制造的概念出发，全面阐述了数字制造的理论基础及科学问题；介绍了数字制造的发展 趋势。
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