This paper focused on public participation in planning EIA(Environmental Impact Assessment)to resolve social conflicts,including what is NIMBY(Not in my backyard) facilities and public participation(the origin of public participation),why the public participation(its significance and theoretical foundation)is needed,how we carry out public participation in the planning EIA and other issues.Planning EIA is a platform on which all relevant parties may communicate,exchange and negotiate in order to reach consensus on values through public participation.The public may get a comprehensive and objective understanding of environmental issues through participating in the planning EIA.Public participation is an important means to obtain the understanding and support by the public especially the adverse environmental impact public.Public participation is also an effective source prevention way to prevent and defuse the adverse environmental impacts and social stability risk that may be a result of the planning implementation at the initial stage.