Abstract: The evolution of pollutant in groundwater in Manzhouli was derived based on the continuous monitoring between 1989 and 1999. The groundwater quality is good except for fluoride which concentration exceeds the standard value. Being affected by the supply of ground surface and hydrogeology condition, the contents of pollutants are higher in May than in September and the yearly evolution is undulant. In total, the water quality in the deeper layers is better than that in the upper layers.