Abstract: Based on the theory of accessibility,the Gaussian two-step mobile search method and the improved potential model are used to analyze the accessibility of Nanjing public library based on GIS spatial analysis.The public library accessibility of each street(town)under the two methods is compared comprehensively,and its spatial distribution is briefly analyzed.The results show that the accessibility levels of public libraries in various streets(towns)in Nanjing are significantly different.The high-level accessibility areas are mainly distributed in the central urban areas where the road network is developed and the public library service capacity is strong.Because the northern part of Liuhe District,the eastern part of Gaochun District and the southeastern part of Lishui District are remote and the accessibility level is poor,it is not convenient to enjoy the public library resources.The level of accessibility presents a spatial distribution pattern of the circle that gradually decreases in the central urban area.The Gaussian two-step mobile search method and the improved potential model are compared and analyzed.The Gauss two-step mobile search method can better reflect the accessibility level of public libraries in each street(town),which is more in line with the actual situation.

Key words: public library;accessibility;spatial distribution;Nanjing