Theoretical and Empirical Research on Time Lag of R&D Based on Knowledge Spillovers—A Case of Beijing

The study on the time lag of knowledge spillovers process is one of the key steps to solve the measurement of knowledge spillovers, which is a difficult problem in the field of technological innovation and regional economic growth. From the perspective of knowledge spillovers, it studies time lag during the R&D process based on the influence factors of R&D time lag, main sources and existing research. Then, taking Beijing area as the research object, it applies the knowledge production function to measure R&D knowledge spillovers and designs multiple regression models. Based on the data of 2002-2010, it analyzes the relationship between R&D and Zhongguancun Science Park's(Z-Park)innovation performance. The results show that the college R&D knowledge spillovers effect has 1 year lag period; college R&D knowledge spillovers in Beijing area have positive spillover effects on Z-Park's innovation performance; the national enterprise R&D's influences on Z-Park's innovation performance reflect the spillover effect caused by the new products.