With Xinxing County of Guangdong Province as the research case , we adopted the grade update evaluation dada of cultivated land quality and land use change data in 2010-2013 .The quantity, quality, temporal and spatial variation characteristics of cultivated land were ana-lyzed in Xinxing County in 2010-2013 , and the changing reason was also analyzed .Results showed that the quantity of cultivated land showed a decreasing trend in Xinxing County in 2010-2013; the dynamic variation degree of cultivated land was relatively small , and the increase of cultivated land mainly came from forest land.The decrease of cultivated land was mainly due to the occupation of land for construction.As for the aspect of quality, the overall quality of cultivated land showed a gradual increase trend in 2010-2013 in Xinxing County, and regional culti-vated land quality had significant change differences.As for the reason of these changes, the land development, construction occupation and the quality of cultivated land were the three main reasons .%以广东省新兴县为例，基于2010～2013年土地利用变更数据和耕地质量等别更新评价数据，分析了新兴县耕地数量、质量及其空间变化特征和变化原因。结果表明，从数量上看，2010～2013年新兴县耕地数量呈现减少的趋势，耕地利用动态变化度相对较小，耕地增加主要来源于有林地，耕地减少以建设用地为主；从质量上看，2010～2013年新兴县耕地质量整体呈现逐渐升高的趋势，区域耕地质量等别变化差异明显；从变化原因上看，土地开发、建设占用和耕地质量建设是耕地变化的3大主要原因。
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