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The spatial expansion of oasis cities and towns is restricted by water resources; therefore, spatial expansion in oasis has a greater impact on landscape than general towns. The article takes a typical oasis town, Ganzhou District of Zhangye City, as a research case. From the perspective of the landscape and land use/cover, we use the boundary of the central city of Ganzhou District in 1987 as the starting boundary of radiation, and divide the radiation area into 15 radiation rings to analysis the spatial expansion and radiation effects of oasis towns, the results show that the land use/cover change rate changes little before the new century and changes dramatically after the new century. Among the responses, the construction land and cultivated land are the strongest. The ring structure of the oasis radiation effect is obvious, which shows that 1 to 5 km is the radiation core zone(core ring layer) of the town, 6 to 10 km is the radiation transition zone(transition ring layer), and 11 to 15 km is the periphery zone (periphery ring layer). A land use transfer matrix shows that the land use conversion is more intense in the core ring layer, the main cause is cultivated land and grassland are transform into construction land, while in the periphery layer, the conversion ratios of other land types and construction land have a higher proportion, indicating that the expansion of towns is constantly expands to the periphery.

Study on the Radiation Effect of Urban Spatial Expansion in an Oasis - A Case Study of Ganzhou District in Zhangye City