This paper adopts a two-step mobile search method (2SFCA) based on GIS to improve the defect of transportation cost factors. Based on the urban characteristics of Yangzhou, this paper studies the accessibility of green park space of typical socially disadvantaged groups in downtown Yangzhou under different travel modes; with the frequency distribution of the recreational needs of the underprivileged groups, analysis of the supply and demand services of parks and green areas in the study area. The research results show that, with the increase in travel speeds, the supply and demand for green space in parks has gradually improved. Meanwhile, the quantity of green space services in parks in the study area has met the needs of typical vulnerable groups in the community, and some areas still have defects.Besides that, the city of green space is small and scattered with poor service in the southeast of the development zone, the south of Guangling District, the southeast of Jiangdu District. And urban fringe areas are affected by factors such as the small distribution of park green space and restrictions on traf c development. According to the research results, corresponding optimization suggestions proposed to promote the improvement of the utilization rate of park green space resources.