With the increase of economic opening,China has become the main inflow country of FDI. However, after a large amount of foreign investment has entered China, how to improve the quality of foreign capital has become the focus of social attention.Based on the provincial panel data from 2000 to 2018,using unit root test,cointegration test,granger causality test and regression model to conduct an empirical study on the impact of domestic trade openness and intellectual property protection on foreign investment inflow in China.The results show that trade openness has a promoting effect on the intensity of foreign direct investment,intellectual property protection has a significant positive effect on foreign direct investment,and the synergistic effect of the two is conducive to the introduction of foreign investment.It is found that the rational and effective utilization of foreign capital depends on the proper protection of intellectual property rights and the openness of trade.