Abstract: Capability Maturity Model Integration (CMMI) is a system of quality management which is widely accepted by small-and medium-sized software enterprises. China has introduced CMM/CMMI and strongly promoted it among its small- and medium-sized software enterprises. During this process, it has been found that the most difficult task is how to implement it and keep it sustainable. This paper, on the basis of analyzing the application and sustainable development of CMMI model in China's small- and medium-sized software enterprises, conducts an investigation on JinHer Company's current quality management of software projects,and the author proposes a CMMI-based project quality management solution, and implements it by systematically customizing and developing JinHer collaboration platform. In this way, it proves feasible for the best combination of project management and CMMI model, significantly improving the company's project management performance.