Abstract:According to the principles of traditional matter element analysis methods, the combined weight method, which is the combination of the AHP method and the entropy method, was used to modify the weights in the matter element analysis method. Then, the relevance was studied through cluster analysis, and thus the traditional matter element analysis method was improved and expanded. Based on monitoring data involving CODMn, COD, TP, NH3-N, and fluoride, at nine water quality monitoring sections on the main stream of the Puyang River in 2012, the improved matter element analysis method was used to optimize these water quality monitoring sections. As a result, the original nine sections were decreased to seven sections after optimization. The results were verified by the consistency test, indicating that the improved matter element analysis method can provide accurate and effective optimization results.