After the survey of pollution source, a study on surface water quality assessment and forcast is given by means of grey system method, fuzzy mathematic method and multivariated analysis method. Based on it, aquatic cnviromment qulity feature, treatment measures and enviromental sterategy are proposed. Quality of aquatic environment on 18 sections of 5 rivers in Tumen River area was studied. The results showed that the pollution of surface water was serious. Water quality of most rivers is between III and IV standard except Hunchun River deteriorated gradually, pollution level of other rivers has been controlled. Main pollutants (including SS, COD, BOD, AR-OH, N-NH₃) resulted from discharge of chemical fiber industry, pulp and paper industry and mines. If the growth rate of industrial value is higher than 25 percent under the encouraging-model of regional exploitation, the pollution load will overtake the bearing force of aquatic environment. Thus, some of protection program against pollution must be worked out in order to achieve harmonious development of economy, society and environment.