The supply process of marathon events, a kind of social consumer goods,belongs to a special event of the city. The supply quality radiates the mirror image of public governance in social, political, economic, cultural, educational, ecological and other fields. The quality control of marathon supply is a complex system of multi-dimensional interest game and multi-subject participation. The diversity of suppliers makes its supply quality restricted by the community of “individual domain” , and there are issues like external quality assessment, radiative quality control power and reactive reverse quality decision making. The supply quality governance of marathon events should promote the public goodwill of governance, realize the “public rationality” of supply quality governance, and achieve the “public good” of good governance of supply quality. At the same time, it is necessary to build a win-win mechanism of shared governance, establish a governance community, clarify governance relations, and regulate the whole process of governance, so as to promote the symbiotic and win-win development in public domain in marathon events.