为研究沿海地区海岸线海水入侵问题，探讨了注水井水力帷幕阻止海水入侵的方法。该方法利用排列注水井，提高注水井沿线的水头高度，阻止海水入侵的发展，驱使海水前锋向海洋方向后退。通过突变界面模型解释了注水井水力帷幕防治海水入侵的机理，证明了注水井水力帷幕的有效作用；利用井流理论得到了注水井水力帷幕各参数间的关系，并利用帷幕建设消耗费用最小的原则，给出了帷幕初步设计方案，通过简单算例进行了分析说明。〖JP〗

 For studying the seawater intrusion problem occurring in the littoral, a new kind of hydraulic curtain is put forward in the paper. A line of water injection wells are set along the coast line, and the ground water level will rise up for the water injection. Then the seawater will be driven back to the sea. The mechanism of the water injection hydraulic curtain is explained based on the abrupt interface model. The new kind of curtain is proved to be effective and feasible as well. Well flow theory is used to determine the parameters of the new curtain. And the elementary design method is discussed by a simple example based on the minimum consumption principle.