Based on the present situation of land resources and the actual situation of social and economic development in Changchun City,this paper selected 15 factors as the evaluation indexes which are from the three aspects:nature,economy and society.Land ecological security situation of Changchun City from 2008 to 2014 was analyzed by using the principal component analysis method.The results showed that the trend of land ecological security in Changchun City from 2008 to 2014 could be divided into three periods:2008-2009 was the decline period;2009-2012 was the rapid growth period;2012-2014 was the steady rise period;overall the land ecological security situation of Changchun City was at the trend of increasing fluctuation from 2008 to 2014,and the land ecological security level changed from extremely unsafe gradeV to ideal for safety grade Ⅰ in a good stage of development.%结合长春市土地资源现状和社会经济发展的实际情况,从自然、经济、社会3个方面共选取了15个因素作为评价指标,采用主成分分析法,运用SPSS 22.0软件,对2008-2014年长春市的土地生态安全状况进行评价.结果表明,2008-2014年长春市的土地生态安全变化趋势分为3个时期:2008-2009年为下降期;2009-2012年为迅速增长期;2012-2014年为平稳上升期;总体呈现波动递增的趋势,土地生态环境安全状况改善显著,土地生态安全等级由极不安全的V级转变至理想安全的Ⅰ级,处于良好发展阶段.
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