Combining with the geological condition of a project,this paper designed the dewatering scheme inside subway foundation pit tube well,mainly elaborated the well location measurement lofting,well drilling,hole cleaning for pulp,tube well installation and other dewatering well construction technology,and summarized the technical key points of construction,so as to take effective underground water control measures, ensured the foundation pit stability.%结合某工程的地质条件，设计了某坑坑内管井降水方案，主要对井位测量放样、成井、清孔换浆、井管安装等降水井施工工艺进行了阐述，同时归纳了施工的技术要点，以采取有效的地下水控制措施，确保基坑的稳定性。
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