The workforce of software is one of the most important factors to the software industry in China. This research is to create software industry model to simulate the trend of software industry scale and workforce effects from 2006 to 2010 by system dynamic theory. The result indicates that the software scale and software workforce are rapid growth from 2006 to 2016. For assurance of the increase to the software industry scale and software workforce, two problems should be focused: (1) the environment of domestic demand market of China, (2) the workforce flow away from software industry, and finally this study discusses the meanings of these two problems.