本文从经济学家张五常先生的“露宿街头还是有屋可住———租务条例宣称的意图与实际效果“的实证研究为切入点 ,反思了城市规划政策中出现的政策意图与实效背离的三个具体现象 ,提出城市规划的研究方法不仅需要规范研究 ,更应该重视实证研究 ,城市公共政策和建议应该以确凿的实证分析为基础 This article starts from the empirical study of Zhang Wuchang, an economist, who still sleeps in the streets or not - the intent and actual effect of the rental regulations, and reflects on the deviation of the policy intentions and effectiveness from the urban planning policies The author proposes that the research method of urban planning not only requires normative research but also empirically studies. The urban public policies and suggestions should be based on conclusive empirical analysis