Taking external foundation pit dewatering of Hangzhou subway station as an example,the paper analyzes the relationship of external foundation pit dewatering and enclosure structure deformation,and initially studies the impact of external foundation pit dewatering upon sur-rounding environment,and obtains dewatering depth and subsidence value of sandy stratum in Hangzhou,and finally points out that:external foundation pit dewatering has great effect for reducing foundation deformation and support axial stress.%以杭州地铁车站基坑实施坑外降水为实例，分析了坑外降水与围护结构变形及内力的关系，并初步研究了坑外降水对周边环境的影响，得到杭州砂性地层的降水深度与地表沉降值，指出坑外降水对减小基坑变形与支撑轴力效果显著。
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