关键词: 政府研发支出, 中小企业, 技术创新, 研发投入

Abstract: Based on theoretical model construction, this paper deduces the static impact mechanism and dynamic spillover law of Government R&D expenditure on R&D investment and innovation output of SMEs, so as to construct an explanation framework from exogenous to endogenous. Further empirical test with panel data of SMEs below industrial industry scale shows that: firstly, the relationship between R&D investment and innovation output is not a simple linear effective relationship, and there is certain threshold law. Only when the R&D investment exceeds specific threshold, the positive innovation output could be released. The lack of R&D investment could not transform innovation output, which is the biggest bottleneck of science and technology-based SMEs survival and development. Secondly, government R&D expenditure has special dynamic regulator function, which has complex nonlinear regulatory impact on the technological innovation performance of SMEs. Medium and moderate government R&D expenditure could transform complementary mechanism with the R&D investment of SMEs, dilute the innovation risk, and drive the innovation performance improvement of SMEs with the symbiosis of “crowding in effect”. However, excessive government R&D expenditure is counterproductive, it will weaken the output performance of innovation input of SMEs, resulting in certain degree of inertia dependence. Finally, the scale heterogeneity test also found that, the innovation incentive threshold of Government R&D expenditure in large enterprises is lower than that in SMEs, the spillover to technology-based SMEs is relatively wider.

Key words: Government R&D Expenditure, SMEs, Technological Innovation, R&D Input