The paper first presented the current status of Mengzhou water environment, and then analyzed the reasons of progressively deteriorating in the city, including the pollution of underground water and surface water, pollution caused by town and township enterprises in countryside, non-point source pollution due to unreasonable use of chemical fertilizer and pesticide, fish breeding and poultry raising and the unsuitable discharge of domestic sewage and garbage by residents. Finally, policies on protection and control methods were put forward regarding the pollution deteriorating of the water environment in the area.