目前我国已进入城市化快速发展阶段。这一时期城市建设的特点体现在城市扩张迅速、建设规模不断增大、建设主体构成日益复杂等方面。这些变化使得城市中违法建设问题大量存在,而规划管理体制和管理手段的相对滞后,使得这类问题得不到迅速有效地解决。违法建设往往成为城市建设中各类矛盾的焦点。解决城市违法建设问题已经成为城市规划建设管理者新时期的一项重要任务。合肥市于2005年7月开始的“大拆违”行动,在短短1年多时间内共拆除各类违法建设面积近1300万平方米,其中“自拆”、“助拆”的占98.5%以上,市民群众对“大拆违”满意度也达到93%。长期以来违法建设泛滥失控的态势得到根本遏制,违法建设制约城市发展的问题基本得到了解决。本文从一个参与者角度,运用公共政策学的博奕理论、利益相关者理论、三圈理论等原理,对“大拆违”的政策制定、执行进行了深入剖析,并提出了一系列切实可行的建议,为今后处理类似问题提供了理论参考和经验借鉴。Today,China has entered a stage of rapid urbanization.During thisperiod,the features of urban constructions appear in the rapid expansion,theincreasing size of the building,the main building of an increasingly complicated andso on.The changes in the city resulting in the problem of lots of illegal construction,and the relatively backwarding of the planning management system and managementtools make these problems resolved slowly and inefficiently.Illegal- buildingsbecome the focus of the all types of contradictions in urban construction and solvingthe Illegal-buildings problems have become an important task of the urban plannersand construction managers in the new period.Hefei City started the " Demolition of illegal buildings" action in July 2005,in aspan of one year the total removal area of the illegal-buildings reached nearly 13million square meters,of which the area of "the Self-demolition" and "thehelp-demolished" accounting for more than 98.5%and the public satisfaction masseson the " Demolition of illegal buildings " also reached 93%.The spreading situation