沙化土地封禁保护是一项由政府推行的具有紧迫性、长期性、可持续性的生态治理工程。该项目涉及国家、地方政府和农户,利用成本-收益法对这三方的封禁保护行为动因进行分析,通过博弈模型解释三方在封禁项目中的策略选择。结果表明:国家有充分的动力实行封禁保护政策,地方政府缺乏动力去执行,农户缺乏保护封禁区的动力。 Closure protection of desertified land is an urgent, long-term and sustainable ecological management project implemented by the government. The project involves the state, local governments and peasant households, using the cost-benefit method to analyze the reasons for the ban and protection of these three parties and explaining the tripartite options in the banning project through the game model. The results show that: the state has full power to impose a ban on protection policies, lack of motivation to implement the local government, farmers lack the incentive to protect the exclusion zone.