The process of urban renewal is a process of property transaction and redistribution of social benefits, in which consultation mechanism is one of the institutional designs determining rules of the game. New institutional economics believe that there is a relationship among institution, social individual behavior, and behavioral outcomes, in which the role of institution is to reduce trading costs. In this paper, it summed up five consulting-trade costs, including multi-subject communication cost, nail household cost, credibility cost, time cost, and social externality cost, which exist in Caojiaxiang self-renewal. It also analyzed its consultation platform, procedures, and contract mechanisms in the consultation mechanisms one by one and further summarized that consultation mechanism of old city renewal should be designed on the basis of accurate cognitive trading costs, so as to organize consultation program, find the right agent to establish consultative platform, and develop binding contract mechanism oriented by group cooperative game.%旧城改造是一次产权交易与社会利益再分配的过程,协商机制是其中限定博弈规则的首要制度设计之一.新制度经济学认为制度、社会个体行为以及行为结果之间存在关联性,制度的作用在于降低交易成本.本文以曹家巷自治改造为样本,总结出利益主体协商中存在的5种协商交易成本,即多元主体沟通成本、"钉子户"成本、可信性成本、时间成本及社会外部性成本;针对其协商机制中的协商平台、协商程序和签约机制进行逐一剖析,寻找降低协商交易成本的施效原理;最后总结出旧城改造协商机制设计应在准确认知交易成本的基础上组织协商程序、寻找合适代理人组建协商平台,并以群体合作博弈为导向,制定捆绑协议机制.
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