Abstract
As the capital of our country, the environment of Beijing should and must be safe. However, serious air pollution, shortage of water resources, increasing water pollution aggravates this problems. Through consulting literatures and field investment, the article evaluated and analyzed urban environment safety, it studies mainly environment unsafe degree caused by impact and harm on urban pollution. Based on the environmental pollution statistics in the 2007、2008、2009,it classified and graded the urban environment safety using analytic hierarchy process method and gray cluster analysis method, the article concludes that the environmental safety degree of each year in Beijing are 6.56、6.93、6.90，at the safe level.
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