Abstract: The spatial distribution and supply of urban park green space have an important impact on the play of their service functions. The quantitative index of per capita park green space area has ignored the issues of accessibility and spatial difference of actual per capita park green space level. As urban green space resources are in short supply, high requirements are raised for the accurate supply of urban park green space. With data analysis based on the Internet location big data platform, this paper has evaluated the accessibility of park green space under different travel modes, put forward the concept of effective per capita green space area from the perspective of accessibility, to analyze the spatial distribution and supply of park green space in the central urban area of Yulin city, and proposed optimization strategy and scheme based on the evaluation results, providing a new idea for the layout of urban park green space.