关键词: 溢出效应, 知识溢出, 溢出时滞

Abstract: By constructing the econometric model, the difference of knowledge spillover effect between different influence factors are analyzed, the relation degree and validity between influence factors and knowledge spill effect are measured. The result indicates that there is a convergent pattern for the steady state in the enterprise knowledge spillover and imitation structure which forms the spiral type evolvement of innovation and imitation. The knowledge spillover effect relates to R&D input, trade and traffic condition, the mobility of labor force, the enterprise knowledge absorbency, the flexibility of market mechanism, the time lag of knowledge spillover, and the changes of factory site, besides trade cost and space-time span. The total R&D input presents a notable positive correlation with the explained variables; economic disparities and the distance between areas or enterprises take on remarkable negative correlation with knowledge spillover effect. The enterprise knowledge absorbency shows direct ratio with knowledge spillover effect. When the enterprise knowledge storage quantity disparity is equal to enterprise knowledge absorbency, the knowledge spillover effect is the biggest. The time lag of knowledge spillover as well as the knowledge degeneration rate display inverse ratio with knowledge spillover effect; the sale income of area or industry, the sum of fixed assets and current assets of this area or industry don't have material influence on the knowledge spillover and the raising of labor productivity. The time lag of spillover is decided by knowledge characteristic and internality level of knowledge externality; the implement approach of knowledge internality depends on many factors, such as the arrangement of property right system, the government protection for innovation main body and moral restraints.

Key words: spillover effect , knowledge spillover , time lag of spillover