本文主要通过1998～2002年各省的国内专利授权量来探讨外商直接投资对中国有无技术溢出效应,其强度如何,以及其正效应能否弥补中国国内企业的损失和全体国民的福利损失,从而考察政府对其实施税率优惠,能否促进全体国民的福利最大化,并促进本国科技实力的提高和竞争力的增强。 This paper mainly discusses whether domestic direct investment has any technical spillover effect on China through the amount of domestic patent grants of various provinces from 1998 to 2002. How strong is its intensity and whether its positive effect can make up for the losses of Chinese domestic companies and the welfare losses of all citizens? Examine the government’s implementation of its tax rate concessions, whether it can promote the maximization of the welfare of all citizens, and promote the improvement of the country’s scientific and technological strength and enhance its competitiveness.