Abstract:At present, China's economic and social reform in public private partnership(PPP)field didn't directly relate to Science, Technology and Innovation(STI), reform of STI didn't involve PPP mode, either. PPP mode has to be expanded into STI and public service sectors urgently. As far as the objectives of thirteenth Five-Year Plan, ensuring R&D investment intensity of the whole society cannot do without PPP mode. The changes, from government's direct investment to social financing, from government management to PPP governance and professional operation, from investment in fixed assets to incentive mechanism of market, cannot only increase the amplification effect of public finance of STI, achieve win-win situation of public and private interests, but also promote optimal allocation of STI resources from various departments. Relevant experiences of PPP mode, leveraging social capital investment in STI in typical countries, showed that closing cooperation of public and private based on transparent rules, and clearing project management demands of the whole life cycle, may not only ease financial pressure on STI spending, alleviate problem of dislocation, offside and absence of government functions, but also significantly encourage the whole society to enhance investment in STI, and improve allocation efficiency of STI resources from public and the whole society. Finally, it was put forward three proposals combined with needs of STI resource allocation in thirteenth Five-Year period. First is fully mobilizing “double positive” of integrated and coordinated sectors and professional sectors of STI. Second is using PPP mode to build a specialized national innovation network on a high level. Third is bringing PPP mode of promoting STI into the whole legal system.