中文摘要：

研究目的：本文以耕地转变为建设用地的可能性为基础，研究耕地的稳定性，为耕地保护提供新的依据。研究方法：本文以大兴区2006年现状耕地为研究对象，从地块尺度综合考虑耕地资源的自然因素、区位因素和社会经济因素建立评价指标体系，对研究区进行耕地稳定性评价，并对耕地的稳定性进行分级，在此基础上对耕地分区、分级保护。研究结果：（1）从地块尺度出发，从耕地转变为建设用地的可能性入手，把大兴区耕地的稳定性划分为4个级别。（2）大兴区耕地不稳定与较不稳定地块之和为1861个，占总数的36．33％；较稳定的斑块数为1703个，占总数的33．25％；稳定斑块数量为1558个，占总斑块的30．42％。（3）大兴区耕地稳定性空间分布特征为不稳定的耕地地块主要分布在大兴区北部发达地区；较不稳定的耕地地块，沿各主要道路呈明显的带状分布。（4）基于耕地资源稳定性评价，将大兴区耕地分级保护，宏观微观相结合，统筹考虑保护区和地块特点，有利于切实做好耕地保护。

英文摘要：

The paper is intended to study the cultivated land stability and provide reference for cultivated land protection, based on the possibility of cultivated land conversion into construction land. This paper examines the cultivated land situation in Daxing district of Beijing in 2006. On the basis of natural, geographical, social and economic factors of cultivated land resource, an evaluation system was constructed by plot dimension and the stability grade of cultivated land was analyzed. The cultivated land in study area was classified by different stability grades and divided into different zones. The results show： （1） the cultivated land stability in Daxing district could be divided into four grades; （2） there are a total of 1861 unstable or relatively unstable cultivated land plots in Daxing, taking up 36.33% of total cultivated land; 1703 relatively stable plots, 33.25% of the total; and 1558 stable plots, 30.42% of the total; （3） the unstable cultivated land plots in Daxing are mainly located in the north part of developed area, while relatively unstable plots are along the roads in belts; （4） basing on cuhivated land stability evaluation, the cultivated land in Daxing was classified for protection from both macro and micro perspectives, which is beneficial to future cultivated land preservation.