Abstract: Discharge of coal mining water may affect the water environment system to some extent． Shengli Coal Mine is located in Hailar River Basin，the coal mining water was designed to be discharged into the tributaries of the Hailar River， with a designed discharge rate of 5 810. 26 m3 /d． As a man-made source of the basin，its discharge water quality，quantity， outlet，and discharge time are the key factors in water environment control． Based on the drainage water quality，the field hydrology conditions，i． e． river regime， flow，water quality，aquatic animals and plants were investigated． Using of hydrological station data and different sections of the river basin control area，flow rates processes at different points were measured by SWAT hydrological model． At the same time，effects of coal mine water on basic hydrology，water environment， groundwater， and others were analyzed． The results showed that the mining water discharged into selected inlet not only has little impact on hydrology and water environment of Hailar River Basin，but also would improve the conditions of water resources utilization．