Abstract: Urban green space is an important part of the urban ecosystem, and its quantity and landscape pattern is tightly related to urban development. This research analyzed three Land--sat/TM images of Nanjing in 1988, 2000 and 2002, The urban vegetation was divided into forest type and agricultural type, and the temporal-spatial changes of landscape pattern dur--ing the 15 years were studied by the landscape index. The results showed that the quantity of urban green space in Nanjing increased by 9. 60%, with the number of patches decreasing, average area increasing, landscape shape being simplified, landscape aggregating and fragmentation being declined Between 1988 and 2000.However, the results were differen, between the forest type and agricultural type: the area of agriculture type increased by 12.80%, and expanded increasingly outside the city zone and.showed a low fragmentation; the area of forest type decreased by 3.60%, while the patches with little area reduced greatly, the landscape shape became more simple, the large forest patches were distributed more isolated, and the fragmentation also reduced. However, between 2000 and 2002, the area of forest type and argicultural type reduced by 0.63% and 14.60%. The large area of patches disappeared. The most important reason for the changes was the intense process of urbanizations. and the natural conditions as well.