中文摘要：

基于永久基本农田概念、内涵和划定要求,提出了县域永久基本农田的定量评价模型与划定方法,并以河北省定州市为例进行示范验证。定量评价模型包括自然禀赋条件、基础设施条件、社会经济条件和区位条件4方面12个指标,并在改进连片度和田间道路密度计算方法的基础上进行综合评价。根据综合评价结果,将定州市耕地划分为优先保护型（≥76.00）、重点保护型（68.91-76.00）、适宜调控型（60.00-68.91）和后备整治型（0-60.00）4种类型,其中：优先保护型（28 389.22 hm^2）集中分布在城区及镇政府周边,是定州市重要的粮食生产基地;重点保护型（39 084.13 hm^2）主要分布在庞村镇、大鹿庄乡、杨家庄乡等,是永久基本农田的重点建设区域;适宜调控型（16 831.95 hm^2）分布较为分散,主要分布在砖路镇、赵村镇、西城区等,未来通过差别化土地整治再适当调为永久基本农田;后备整治型（5 126.82 hm^2）零散分布在西城区、北城区、息冢镇等,目前不适宜划作永久基本农田。研究结果可为定州市永久基本农田划定与相关规划提供依据。

英文摘要：

It is meaningful to research the delineation method of permanent basic farmland on the county scale.The comprehensive model was presented to evaluate the farmland and delineate the border of permanent basic farmland.The hierarchy of the model was firstly introduced accounting for these factors such as natural resources,infrastructure development,social-economic condition and location condition.Then,as a case study,the model was used in Dingzhou City of Hebei Province and the comprehensive scores for the patches were produced.The farmland patches in Dingzhou City might be divided into four regions：priority protection region（PPR）,key protection region（KPR）,suitable control region（SCR）and further regulation region（FRR）.The area of PPR was 28 389.22 hm^2 with scores higher than76.00.Besides,PPR was distributed mainly in surrounding area of the city and major towns and it was the important grain production base.The area of KPR was 39 084.13 hm^2 with scores between 68.91 and76.00.Besides,KPR was mainly distributed in Pangcun Town,Daluzhuang Town and Yangjiazhuang Town and it was the important construction area of permanent basic farmland.The area of SCR was16 831.95 hm^2 with scores between 60.00 and 68.91.Besides,SCR was distributed separately and the diversified land consolidation projects were needed to be implemented.The area of FRR was5 126.82 hm^2 with scores lower than 60.00.FRR was mainly distributed in west district,north district and Xizong Town and it was not suitable for delineating permanent basic farmland.These results would provide the scientific basis for delineation of permanent basic farmland and the relative basic farmland plans in Dingzhou City.