中文摘要：

乌鲁木齐市是我国西北干旱区的特大绿洲城市,近几年来随着人口的增长与经济的发展,尤其在＂一带一路＂的背景下,城市的扩张十分明显,深刻地影响城市周边的生态环境.快速准确地获取城市扩张信息,并分析其驱动力机制,对于指导城市规划,优化西部生态环境与可持续发展都具有十分重要的意义.仅利用NDBI指数法提取城镇用地信息的方法具有局限性,结合半监督分类的方法,能够有效提取干旱区城市用地信息.综合研究结果,城市格局的演变受地貌、水文、人口、社会经济、规划决策等方面约束或推动的影响,体现在小部分的内部填充和发生在城市边缘土地向建设用地的转化,形成＂东延西进,南控北扩＂的发展格局,向北扩展成为长期发展的主要方向.

英文摘要：

Urumqi is a king-size oasis city in arid regions of the northwest. In recent years, as population growth and economic development, the expansion of cities is obvious, a profound impact around the city ecosystem, especially in the context of western development. It＇ s of great significance for guiding urban planning, optimizing western ecological environment and sustainable development to quickly and accurately obtain information on urban expansion and analyze its driving force mechanism. It＇ s limit to only use the NDBI index method for extract urban land use information. Combining with semi supervised classification method, can effectively extract the urban land in arid areas. Comprehensiving research results, the evolution of urban landscape by geomorphology, hydrology, population and social economy, constraints or to promote the effect of planning and decision-making. It Reflected in a small number of internal padding and the city fringe land to construction land conversion. It also form ＂the east to the west, south point north expansion＂ development pattern, north extension become the main direction of long-term development.