中文摘要：

以吉林省通檎县为例，构建了县域农业可持续发展的生态安全评价指标体系，采用均方差法确定了评价指标的权重，对研究区1985、1990、1995、1998、2001、2004年6个时段的农业生态安全进行了评价。从评价结果可以看出，近20年，通檎县农业生态安全呈现下降态势，安全等级处于Ⅲ～Ⅴ级，安全状态从敏感态下降到风险态。1998年是研究区农业生态安全交化的转折点，从1998年起，农业生态安全有所回升。在分析交化原因的基础上，提出农业可持续发展的生态安全建设对策。

英文摘要：

As a case study of Tongyu county, Jilin Province, This paper established the indicator system of ecological security on agricultural sustainable development, determined the weight of the indicator by the method of mean square deviation, and evaluated ecological security on agricultural development among 1985, 1990, 1995, 1998, 2001 and 2004 by using the model of ecological security. The result showed that the ecological security of agriculture had being decreased during the past 20 years, the grade of ecological security of Tongyu County of the above motioned 6 years was between Ⅲ and Ⅴ, and the security dropped from sensitive state to risk state. 1998 was the turning point, from which the ecological security of agriculture had being recovered. The strategies of construction of ecological safety on agricultural sustainable development are put forward.