关键词: R&D投资, 门限效应, 工业部门, R&D investment, threshold effect, industrial department

Abstract: R&D investment is the key to change economic development pattern and enhance the industrial competitiveness. In recent years, with the increasing R&D espenses in China, whether the more R&D investments are the better has become a much-debted issue. This article uses the panel datas of 36 chinese industies from 2002 to 2009 as samples and applies the threshold regression model to test the influence of R&D investments to the performance of thoes industies. According to the empirical results on the basis of all industrial sectors, 0.0089 is the single threshold value of R&D strength. Moreover, it is demostrated that the action mechanism of R&D investments is obviously different in those industries with diverse qualities. Specifically, the threshold effects in the industries of mechanical and electronic and resources processing are relatively more remarkable, and the threshold values(0.0125&0.0020) reflect the characteristics of factor intensity; In addition,there is no threshold effect in the taxtile manufacturing because of its lower R&D strength.