Abstract: As an important point of the ecological environment effect, monitoring and analysis of underground water level had provided some basis for the ecological environment in the region. The results of Tongliao underground water level monitoring in 2015 showed that the deepest of groundwater level depth was 3 480 centimeter deadline to December in county of Kulun. The lowest of groundwater level depth was 208 centimeter in the city of Huolingol. The underground water level declined from 20 centimeter to 64 centimeter in the whole Tongliao city except this northern part and the Kezuohou banner. The reason of underground water level downward included insufficient natural precipitation, increase of farmland irrigation and irrational exploitation of ground water. From the months of view, the underground water level had picked up on the precipitation concentration months. The main factor of underground water recharge was precipitation with hysteresis in Tongliao city.