基于“双缺口”理论建立模型,实证分析了我国外资适度规模问题,结论表明:我国对外资的利用存在适度规模问题,外资实际规模与外资适度规模之间存在着较大的“缺口”;不合理的外资规模对我国经济的发展具有负效应,其原因是外资投向的产业结构和地区结构不合理,以及对国内企业的“挤出”效应所致。 Based on the theory of “double-gap”, this paper establishes a model to empirically analyze the appropriate scale of foreign investment in our country. The conclusion shows that there is a moderate scale problem in the utilization of foreign capital in our country. There is a big gap between the actual scale of foreign investment and the moderate scale of foreign investment. The reasonable scale of foreign investment has a negative effect on the economic development of our country. The reason is that the industrial structure and regional structure of foreign investment are irrational as well as the “crowding-out” effect on domestic enterprises.