Taking Xi′an city as an example, on the basis of Xi′an city master planning (2008—2020) and the green space landscape index, 15 patches were defined as the core “node” of green space network. Minimum cost distance method was used to build the potential green corridor network of Xi′an city, and with the improved gravity model and the variation coefficient the green corridor network was optimized.It concluded that the overall level of landscape fragmentation of Xi′an city was high. The number of urban green patch was large, but patch area was relatively small.Though potential corridors were roughly balanced in Xi′an city, the city center were greatly influenced by human activities, and blank corridors exist.Variation coefficients of the intensity of gravitational attraction between different patches were different, suitable corridor optimal threshold value were obtained by comparison and analysis.Central corridors, crucial corridors, general corridors were divided by threshold of 8.765 and 0.330, respectively.The optimized green corridors, zonal greenbelts along the river, greenbelts of road made the green corridor network of Xi′an city.

urban green space network; minimum cost distance; improved gravity model; Xi′an city