中文摘要：

＂最优城市规模＂问题一直是城市研究领域备受关注的重要议题。梳理总结最近二十年国内外最优城市规模相关研究成果文献发现,研究视角大体上有成本—收益分析视角、公共产品供给视角、城市增长视角、新经济地理学视角、国民福利视角和可持续发展视角等六大类。最优城市规模问题后续研究的主攻方向主要集中在：注重借鉴多学科理论、方法开展综合性研究,加强资源环境约束和国民福利视角的最优城市规模研究;聚焦最优城市规模决定机理、外部效应、管控路径等理论问题研究;重视个案研究和实证研究。

英文摘要：

The optimal city size has always been an important issue in urban studies. Related literatures review suggests that scholars have studied the subject mainly from six research perspectives including cost-benefit analysis, public products supply, urban growth, new economic geography, national welfare and sustainable development in recent 20 years. Future research should focus on comprehensive study using muhidisciplinary approach, and two special perspectives of national welfare, resources and environment constraints. Meanwhile, we should devote more attention to the studies of the determinants, external impacts and regulating mechanism of the optimal city size. In addition, case studies and empirical research should be valued as well.