基于我国制造行业的面板数据,本文分析了国际贸易对我国R&D投入的三种不同的影响机制。由于R&D投入具有两面性,外部技术机会一方面会替代行业内的R&D投入,另一方面又会激励R&D投入。我们的回归结论显示,整体而言,国外技术机会对我国制造行业的R&D投入具有显著的正向作用,而国内行业间的技术机会具有相反的影响;此外出口的扩大反而会降低我国行业的R&D投入,而进口竞争只是对高科技行业的R&D投入具有显著的正向影响。 Based on the panel data of China’s manufacturing industry, this paper analyzes three different mechanisms of international trade on R & D investment in China. Due to the dual nature of R & D investment, external technical opportunities will replace R & D investment in the industry on the one hand, and stimulate R & D investment on the other. Our regression conclusion shows that, on the whole, the foreign technological opportunities have a significant positive effect on the R & D investment in the manufacturing industry in our country, while the technological opportunities in the domestic industries have the opposite effect. In addition, the expansion of exports will reduce the R & D Investment, while import competition only has a significant positive impact on R & D investment in high-tech industries.