The bioassessments of water quality by using Shannon's diversity index and indicator organisms of macroinvertebrates have been carried out around Beijing, Tianjin and adjacent area during 198S'-1987. The results obtained indicate that the joint indicator of diversity index and species indicator of benthic macroinvertebi ates can be satisfactorily used to evaluate and classify the status of water quality into 5 classes i.e. clean water, light pollution, moderate pollution, henvy pollution and serious polluti...