Scientific and technological innovation system is the key to constructing innovative style country.This paper points out the plan for constructing scientific and technological innovation system after survey and research into Sichuan's scientific and technological innovation which is taking enterprise technology alliance as the leading role,organizing new and high-tech research and development team connected by production,learning and research which is linked by the alliance,taking scientific and technological innovation resources of new and high-tech zone agglomeration as the platform and taking governmental policy support as the basis.