|（1.Department of Physical Education，Guangdong Commercial College，Guangzhou 510320，China；2.Department of Physical Education，School of Education，SUN YAT-SEN University，Guangzhou 510275，China）
Abstract: Supplying sport public goods is a responsibility of governmental sport management departments. How-ever, the negative externality of the governmental behavior directly affects the effect of the government exerting its public service functions. With the help of the externality theory and public selection theory, the authors expatiated on the expressions of and causes for the negative externality of the behavior of governmental supply of sport public goods, and put forward ideas for lowering the negative externality of the behavior of governmental supply of sport public goods, such as to supply sport public goods in multiple ways, to establish a smooth interest group expression mechanism, to define governmental functional boundaries with legal rules, and to enhance governmental supply quality with performance evaluation.
Key words: sport sociology；sport public goods；governmental supply；negative externality