Engineering dewatering is a decisive step in the process of subway construction, which has direct impacts on the duration and security of a subway project and influence of the quality of the entire project to a great extent. During the excavation, sudden inrushing is likely encountered; reasonable and effective control measures on groundwater must be taken to prevent the soil from infiltration deformation and inrushing to ensure construction safety. Tube well dewatering has been so far the most widely applied method in the subway construction projects in Beijing. Based on the engineering cases, the paper discussed a series of issues on tube well dewatering about the design, construction and monitoring, which can be referred by similar projects in future.