Abstract: Based on theory model of "the Triple Helix" for SP, this paper introduces the concept of "knowledge filter" and divides the growth of SP into innovation an d commercialization of knowledge, university-industry relations as well as exte rnal factors of industry agglomeration and spillover effect. The empirical study on the panel data of the economic growth of SP shows that the driving factors h ave turned out to be better ones when China's SP are at their mature stage since the 21st century.