中文摘要：

以适宜度模型为依据，选取了8个指标因子，采用层次分析法与模糊集合理论建立了南北分界带定量计算模型，基于GIS技术的空间分析方法对南北分界带进行了模拟．结果表明：中国南北分界带涉及四川、甘肃、陕西、湖北、河南、安徽、江苏等7个省的130个县（市），最窄处陕西省洋县，宽约26．42km，最宽处在江苏省邳州市到定远县，宽约195．41km，总面积约为145500．74km^2．中国南北分界线总长度约为1666．28km．

英文摘要：

Attempts were made in the paper to develop some quantitative methods for mapping the north-south demarcation zone in China. Eight indicators, related to climate and human factors, were selected to quantify the susceptibility of the north-south demarcation. Methods of analytic hierarchy process （AHP） and expert score ranking combined with fuzzy set theory were applied to assign the weight for each indicator and to define the membership functions. The geographic information system （GIS） was used to manage the spatial d~atabase and conduct the spatial analysis. According to the spatial calculation of the model integrated with GIS,, the north- south demarcation zone was mapped and the results showed that the north-south demarcation zone involves 130 counties or cities in seven provifices （Sichuan, Gansu, Shaanxi, Hubei, Henan, Anhui and Jiangsu）. The narrowest strip is located in Yangxian county of Shaanxi province with a width of 26.42 km. The broadest strip is located from Pizhou city to Dingyuan county of Jiangsu province with a width of 195.41 km. The total area of the demarcation zone is approximately 145 500.74 km2 and the north-south dividing line is about 1 666.28 km in total length.