中文摘要：

作为吸引外资最大的发展中国家，随着引资规模的不断扩大，我国吸引外资过度的呼声日高。为此，本文以省级面板数据为基础，利用双边随机前沿模型，对我国吸引外资最优规模及实际利用外资偏离最优规模的程度进行了测算。结果表明：（1）我国吸引外资规模相对于最优规模，整体呈现下偏效应，下偏度为22．35％；（2）东部地区吸引外资规模相对于最优规模整体下偏效应比中部与西部地区严重，西部地区次之，中部地区最低；（3）省际间吸引外资规模相对于最优规模下偏效应差异较大，下偏度最高省份是最低省份的10倍多。可见，我国吸引外资不是过度而是不足，且区域间引资规模相对于最优规模的净效应差异较大。因此，因地制宜、采取积极措施吸引外资仍是促进我国区域及国家经济增长的重要举措。

英文摘要：

As the largest developing country with continuously increasedFDI scale, China is considered to have attractedexcessive FDI. Based on the provincial panel data, we estimate the optimal scale of FDI and the degree of deviation of actual utilization of FDI from the optimal scale in China according to two-tier stochastic frontier model. The results show that：（1） compared with the optimal scale, the actual utilization of FDI as a whole is lower, with the degree of deviation 22.35% ;（2） compared with the optimal scale inthe regional level, the deviationof FDI in the eastern area is the largest, followed by the western region and the central area is the smallest; （3） compared withthe optimal scale in different provinces, the deviations of actual utilization of FDI show great dif- ference, with the amount of the highest province about ten times more than that of the lowest province. It can be concluded that our country＇ s foreign investment is not excessive but insufficient, and there are largedifferences among areas and provinces. Therefore, it is still an important way to adjust measures accord- ing to local conditions and take active measures to attract foreign investment in order to promote the regional and national economic growth in China.