中文摘要：

本文基于边际等值原理，综合城市经济效益、社会效益、环境效益以及建设效益，构建多因子城市建设用地最优规模决策模型，并结合我国城市建设用地供给实际进行分析。结果显示：2001—2015年，我国城市发展经历了从建设用地短缺到最优及至过剩的过程，对建设用地增长的强依赖逐渐转变为弱依赖。城市建设用地增长与边际建设效益弱相关；与边际经济效益之间呈库兹涅茨倒U型曲线关系；与边际社会效益呈正相关、边际环境效益呈负相关。目前我国城市建设用地已经达到最优规模，其中建设用地供给与经济发展失调，是导致净效益下降的主要动因。

英文摘要：

Based on the principle of equivalent - marginal, comprehend economic benefit, social benefit, and environmental bene- fit, established benefit, the paper constructs the multiple - factor model of optimal scale decision of urban land in China. The conclusions include ： from 2001 to 2015, Chinese cities has experienced a process from shortage to optimal and even excess of urban land demand, in- dicating its dependencies to urban land is weakening. Firstly, the growth of urban land is not associated with marginal benefit of establish- ment. Secondly, the relationship between urban land and marginal benefit of economy is Kuznets inverted U - shaped curve. Thirdly, the growth of urban land is negative correlation with marginal benefit of environment, and positive correlation with marginal benefit of sociology. Urban land in China has reached the optimal scale. The decline of benefit is attributed to inconsistency between growth of urban land and urban economic development mode.