The study quantitatively evaluates the accessibility and service coverage of Shanghai pocket parks using GIS network analysis and a dissimilarity index, which utilizes data from 476 existing pocket park sites, OpenStreetMap-derived road networks, and WorldPop population grids. The results show that the total service areas of pocket parks within 5 min, 10 min, 15 min, and 30 min service zones cover approximately 7 809.55 hm2 (1.12% of the total area), 27 393.22 hm2 (3.94%), 52 156.16 hm2 (7.50%), and 132 811.53 hm2 (19.10%), respectively. For the served population, while the service coverage ratio is relatively higher in central urban areas, the per capita service area of pocket parks remains at a low level. Specifically, the per capita service area within 5min,10min,15 and 30min service zones ranges between 0.43～9.57 (1.80±2.21) m2, 0.11～3.18 (0.56±0.75) m2, 0.05～1.76 (0.32±0.41) m2, and 0.03～0.75 (0.15±0.18) m2, respectively. There is a significant spatial differentiation feature in the population served by pocket parks. The findings provide data-driven insights for planning optimized and equitable urban micro-public spaces.