Abstract: With the continuous advancement of urban modernization, the stable operation of subway station is related to the safety of people's lives. The installation and construction of subway water supply and drainage is a very complex process, which is also an essential project in construction projects. The construction quality directly affects the use of buildings. With the progress of science and technology, the production technology and construction technology of various industries are developing towards a higher level, which is the inevitable requirement to adapt to the development of The Times. At present, the design, construction, operation and other aspects of water supply and drainage and fire protection system engineering have put forward higher requirements, so it must arouse the attention of relevant personnel.