Application of Grey Relation Analysis in Evaluation of Water Quality

In view of the deficiency of classic method evaluating water quality. A grey relational analysis model is proposed to evaluate water quality in river. The principle of grey relational analysis and its process are introduced. Suzhou river was selected and assessed by using this method. And it was found that, compared with the fuzzy complex judgment method, the result was remarkably different. The possible reason for this was given. Additionally, this paper proposes preventive measures against river contamination, which could provide a basis for marine environment protection.