Abstract: During the construction and operation of urban rail transit underground lines, there are many unavoidable problems such as structural leakage and wastewater flushing, etc. Too much water is liable to cause monolithic roadbed diseases, reduce the life of monolithic roadbed, affect the normal work of switch machine and threaten the train normal operation. Discharge the water timely and effectively is of great significance to track system, tunnel structure and maintenance of the related equipment. Aiming at the problem of ballast water accumulation, the operating lines in China are investigated, and combined with the existing drainage schemes for underground lines, improvement measures for station wastewater pumping, section wastewater pumping, switch machine foundation pit and floating slab drainage are proposed, in order to solve the problem of water accumulation in track area.