公共政策的合法性是政治系统输出的合法性,也是一个政权或政府赢得长久稳定与执政的基础,其合法性是实质合法性和形式合法性的统一。宪政制度和政策的绩效是公共政策合法性的基础与源泉,丧失了基础就意味着合法性受到了侵蚀,引发公共政策合法性危机,公共政策危机往往存在着主体、内容、过程三重表象。 The legitimacy of public policy is the legitimacy of the output of the political system. It is also the basis for a regime or government to win long-term stability and governance. Its legitimacy is the unity of substantive legitimacy and formal legitimacy. The performance of the constitutional system and policy is the basis and source of the legitimacy of public policy. The loss of the foundation means that the legitimacy has eroded and triggered the crisis of the legitimacy of public policy. The public policy crisis often has the triple appearance of subject, content and process.