As an important public service resource of the city, park green space plays an increasingly important role in improving livability of the city and enhancing well-being of residents. Based on GIS technology, this paper analyzes the temporal and spatial variation characteristics and influence factors of urban park green space accessibility in central area of Urumqi from 2007 to 2017, using the minimum distance method and the travel cost method considering the topographic factor, so as to provide scientific basis for layout of the green space of Urumqi parks. The results show that:1)The area of green park in central city of Urumqi continues to grow, and the spatial distribution shows a characteristic of "more in the south and less in the northsouth more north and less north". 2)From 2007 to 2017, the spatial and time accessibility of the green park in the central city increased greatly. The spatial accessibility shows a "circle layer" distribution feature, and time accessibility shows a "T"-shaped distribution feature. Both of them show a characteristic:gradually decreasing from the center to the periphery. Additionally,93.14% of the settlements can reach the nearest park green space within 5 min by 2017. 3)The density of road network, the area and shape index of park green space and the linear distance from residential space have significant influence on the accessibility of park green space. The density of road network and the distance between park green space and residential space are the key factors. 4)The change of green space layout is a main reason for the improvement of the accessibility in east-west direction,and it contributes more to the increase of accessible area within 5 min. The improvement of road network has a positive effect on the accessibility of park green space in the north-south direction, which plays an important role in area expansion with 5-30 min. The improvement of road network is the main reason for the improvement of green park accessibility in Urumqi.
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