Yulin District and Hengshan County were taken as the cases, and ecological security index system was constructed to assess the security levels of the two regions.

• 选择了榆林市和横山县两个行政单元，针对区域特征，构建了不同尺度上的生态安全指标体系，利用层次分析法，对不同尺度上生态安全的空间分异进行了研究。