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In order to assess index weighted value scientifically, the matter element were introduced into the fuzzy weighted values to set up matter element model based on fuzzy weight. In this way, the model not only holds the merit of classical matter element, but also overcomes its limitations in practice. Referring to Chinese water quality standard, water quality degree of river is divided into 5 grades in this paper. Five indexes, namely DO, CODMn, BOD, NO3-N and Huifafen are selected as evaluation indexes. The model was applied to evaluate water quality of Jialing River and the results are in line with the actual. It showed that water quality of Jialing river is III in Nanchong,while the water quality of Xiaodukou is most serious. The proposed method is proved to be reasonable and reliable, and can be used in comprehensive evaluation problems of water quality. Finally, we analyze the causes of water quality in Jialing River and put forward the control measure

Based on Fuzzy Weight Matter Element to Evaluate the Water Quality of Jialing River in Nanchong, China