Based on the "Pressure -State -Response" model framework,which was put forward by UNEP and OECD,the evaluating index system of ecological security was constructed. The ecological security from 2005 to 2009 in Chuxiong Prefecture was analyzed and evaluated with principle component analysis method. Pressure index,State index and Response index increased from -3.748, -2.073, - 2.362 to 3.492,1.988, 3.745. Composite index of ecological security increased from -4.648 in 2005 to 5. 19 in 2009. The rank of each year about eco - security was 2005 <2006 < 2007 <2008 <2009. The results showed that the ecological safety of Chuxiong Prefecture is in good conditions, and the economic and social development is within the carrying capacity of existing environment.%采用联合国环境规划署(UNEP)和经济合作发展组织(OECD)提出的“压力(Pressure)—状态(State)-响应(Response)”模型,建立了楚雄州生态安全评价指标体系,运用主成分分析法对楚雄州2005 ～ 2009年的生态安全进行了分析和评价.结果表明,压力指标、状态指标和响应指标分别由-3.748、-2.073、-2.362增长至3.492、1.988、3.745,生态安全综合指标从-4.648提高至5.190.各年的生态安全综合得分排序为2005年＜2006年＜2007年＜2008年＜2009年.可见楚雄州生态安全总体状况较好,经济和社会发展在现有生态环境的承载力范围之内.
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