Based on survey and case study of implementation of CMM / CMMI in Neusoft Corporation (Neusoft hereinafter), the paper elaborates on the background and performance in deploying CMM/CMMI to unveil the characteristics of ‘institutionalization’ in the improvement of software corporation. The research shows the manufacturing process of software in Neusoft turns to be institutional and habitual by importing CMMI and CMMI played the promoting and leading role in standardization, scalerealization and maturation of Chinese software industry.