从重庆市忠县地理位置的典型性和敏感性，生态环境的脆弱性，水利设施布设的必要性和虾子岭流域研究前景的优越性出发，借助于SWAT模型，对忠县虾子岭流域地表径流特征进行时空分析，用于确定急需进行水量调控的区域，为区域径流调控体系的布设提供理论依据。研究发现，地表径流量多的东部区域已经布设了较多数量的蓄水工程，流域西部区域应成为未来调蓄水工程布设的重点考虑区域，但工程布设后调蓄水时间的选择不能仅仅依赖地表径流量的多少，而应进一步结合作物需水量的计算，最终确定合理而科学的拦蓄水时间。

 The reasonable allocation of a farm land water project ， is an important method in improving the water resources use efficiency and fighting down natural disaster in lower hill regions. Grasping the temporal and spatial distribution of regional water resources, and identifying the regional water balance between supply and demand are the key point of the development of regional water project allocation scientifically and effectively, and the enhancement of regional water resources utilization. Considering the Zhongxian County ' s representative and sensitivity of location, its vulnerability of ecological environment, its necessity of water conservancy facilities, and the superiority of study prospect in Xiaziling watershed, the spatial and temporal variation of Xiaziling watershed in Zhongxian County is studied with the SWAT model to confirm the regions for urgent water resource allocation, and then it will provide theoretical foundation in allocation of regional runoff control system. It is found that the earth ' s surface runoff in the eastern region is much more than that in the western region. Since there are a greater number of water storage projects in eastern regions, the western region should be the focus of the next tune to consider the regional water storage project layout. But, the selection of water storage time can not simply depend on the amount of surface runoff, it should be further combined with the calculation of crop water demand, so that a reasonable and sciontific impounding time may be ultimately determined.