文档介绍：II Abstract City is a center of politicseconomyand culture of nation and region. It has densely populatesocial influenceconcentratedproperty and wealth. The urban development in the western China influences prosperityof western region and the progress of Western Great Exploitation. Along withthe progress of western greatexploitation and development of western region sensitivity andfrangibility ofecosystem will be moreprominent. So, researching disaster prevention of westerncityreacting deliberately to the threatof urban nature disaster and reducing the loss in which urban disasters resulted as low as possible will be more important. Firstlythis paper collects the pertinent literature and datasortsthe information about majornaturaldisaster in the western Chinaand on the basis ofthe disaster science and urbandisaster preventionscienceanalyzes causation and evolution and hazards of these disaster. pared with urban majornaturaldisasterof other regionsummarized the specialties of the western urban disasterand according to the actualcircumstance of western cities this paper proposes harness countermeasures. Finally this paper studies western urbandisaster prevention planningas viewed fromurban land evaluationurban green space system and urbandisaster prevention space planning. Along with therapid development of society and economic of westen citieswestern urban disasterprevention and reduction will be more valued, and the status of urbandisaster prevention planning in the system of urban planning will also be raised to an unprecedented position. And then the study on western urban disasterprevention and reduction will be more scientific rationalnormative prehensivetoo. Key Wordsurban major natural disaster in the western Chinacountermeasure urban disaster prevention planningurban disaster prevention space system 独创性声明本人声明所呈交的学位论文是我个人在导师指导下进行的研究工作及取得的研究成果尽我所知除文中已经标明引用的内容外本论文不包含任何其他个人或集体已经发表或撰写过的研究成果对本文的研究做出贡献的个人和集体均已在文中以明确方式标明本人完全意识到本声明的法律结果由本人承担学位论文作者签名日期