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• Application of multi-source data in accessibility indicator evaluation. • Multilevel search radius is adopted. • The inverse distance weighting method is used for indicator visualization. • Suggestions for urban renewal based on accessibility indicators. Rapid urbanization in China results in an uneven distribution of Urban Green Space (UGS) resources. This study aims to provide a scientific basis for optimizing the layout of UGS during the urban renewal process. This study takes Qingdao City Center of China as an example. Using the expanded model of Gaussian Two-Step Floating Catchment Area Method, different search thresholds are set based on the service scale and radius of UGS. This analysis delves into the distribution characteristics of UGS accessibility by walking. The results show that the accessibility of UGS in the Qingdao City Center presents an obvious circular structure, with Badaguan Block and Jinmen Block as the high-value core of accessibility that gradually decrease toward the periphery. There is a significant gap between the supply of UGS and the actual demand of the residential population, and 65.49% of residential quarters in Shinan District have lower accessibility of UGS than the average level of the whole district. According to the results of accessibility analysis, the optimization strategies and spatial intentions are proposed from three aspects: the renewal of existing spaces, the integration and utilization of resources, and the improvement of the UGS system. [ABSTRACT FROM AUTHOR]