As the important part of water resource planning and management,water environment evaluation and forecast are of vital realistic significance to promote sustainable utilization of water resources.Using the data derived from the surface water environment monitoring of industrial park in Cangxi County,surface water environment evaluation of Diemagou River is made by applying the method of single standard pollution index.Then,the method combining complete mixing model with one-dimensional water quality model is applied to carry on surface water environment prediction in the downstream of sewage outfall of Diemaqiao River.The result of evaluation and prediction is analyzed preliminarily.At last,corresponding countermeasures for prevention and control of water pollution are presented to provide an essential scientific basis for making macro-policies of water environment and a regional economic development plan.