公共行政学的合法性危机由来已久.从历史看,通过对西方建构公共行政学的五种路径分析发现,其合法性危机的根源在于公共性的缺失.从理论看,应从公共行政的权力、主体、客体、方法和价值等几个维度来界定公共行政的公共性.从实践看,中国的公共权力框架的独特性、传统政治文化对我国公共行政公共性的影响和中国所处发展阶段对公共行政公共性的规定,构成了中国公共行政学建构中公共性的独特性.中国公共行政学科建构应以公共性为合法性基础实施再造,以历史逻辑、理论逻辑和实践逻辑为根据,坚持公共性的价值引领,用公共性框定研究对象,建构中国公共行政学的“公共性”话语体系,最终形成“公共性”导向的研究范式,夯实公共行政学科建构的合法性基础.“,”The legitimacy crisis of public administration has a long history.From a historical perspective,an analysis of five Western pathways in the discipline of public administration shows that the roots of this crisis lie in the lack of a public nature.From a theoretical perspective,the “publicness” of public administration should be defined along the dimensions of public administration powers,actors,targets,methods and values.In terms of practice,the uniqueness of China's public power framework,the influence of traditional political culture on the public nature of Chinese public administration and the provisions governing this public nature at different stages of China's development constitute the unique public nature of the construction of Chinese public administration.The discipline construction of Chinese public administration should be rebuilt so that its public nature forms the basis of its legitimacy,in accord with historical logic,theoretical logic and practical logic.We should construct a publicness discourse system of Chinese public administration that adheres to the value guidance of publicness and should frame research topics on the basis of publicness.This will ultimately form a research paradigm for the public nature of public administration that will consolidate the foundation of the legitimacy of the discipline construction of public administration.