Cities located in sustainable development experimental districts value the vital supporting role played by their corresponding green space systems. A rational layout of an urban green space system can increase the urban ecological space capacity and meet the various demands of populations in different locations. Citizens are an important indicator for evaluating the success of an urban green space system. This study used residential points and green space systems in electronic navigation maps produced by and the GIS buffer analysis method to analyze the patch characteristics of urban green space systems in the four representative national sustainable development experimental districts. These were-Xicheng district, Shijingshan district, Shaoxing City, and Rizhao City. In addition, a comparative analysis of the amount of people within different time distances from green spaces (< 5 min, 5-15 min, and 15-30 min) in urban residential districts was used to assess green space accessibility and service ability. The results showed that the distributions of the green space systems in the four sustainable development experimental districts were reasonable and that they were widely accessible, especially with regards to people who lived within 30 min of green space, which covered 95% of the local residents. More than 80% of the residents could reach any nearby green space within 15 min, which provided a good foundation on which the urban green space management department could build "a quarter of an hour life circle." However, at the same time, we found that the green spaces providing services were dispersed and small and that large green space areas were limited. Most of the green areas within the different time/distance radii were subject to higher population pressures. The results from this investigation suggest that urban planning processes should consider the time/distance factor for residents when planning a green space system. In addition, this study used electronic navigation maps, which are widely available, to analyze urban green space system accessibility. The results of this study are relevant to areas where urban residents were living and working, which will have practical significance when planning an urban green space system.