Based on the theory of risk arena,this paper takes the event of garbage classification transfer station of BOBO community for instance to see the logic of MIMBY risk and ids operation mechanism，which may uncover the crux of Chinese NIMBY conflict dilemma. Firs，as a product of social interaction，different risk mental schema and risk construction strategy is the internal driving force of NIMBY risk operation in risk arena. Therefore，mismatching of risk cognitive structure is an important factor which may cause the failure of risk communication. Second，the rising housing consciousness and lacking of instant isolated interest expression mechanism leads to community residents' unconventional action to break game rules that unilaterally dominated by local government in order to informally express interests. Finally，the particularity of NIMBY projects shows that it is an important carrier of local leaders of economic resources and political resources. And the particularity of NIMBY projects may result in collective events，which may erode the social basis of the authority of local administration，cause ruling crisis and make it into a new round of“establishing-protesting-postponing" action.