Abstract: This paper establish impact factor model among government R&D investment, enterprises R&D investment and IPRP strength on the basis of public goods theory and innovation theory. This paper uses the data of 1992-2012 for regression analysis, discovers that governmental R&D investment in enterprises, in institutions，in universities has a leverage effect on enterprises’ R&D investment, though the leverage effect caused by governmental R&D investment in universities is not prominent, that proper intellectual property rights protection can promote Chinese enterprises’ R&D investment. The further Granger causality test shows that intellectual property rights protection produced structural changes in Chinese enterprises’ R&D investment around 2002, its leverage effect goes up to 0.147, which is double of previous effect, exceeding the leverage effect caused by governmental R&D in institutions and in universities; it verifies intellectual property rights protection is the source of power for promoting Chinese enterprises technology innovation.