A Weight Absolute Grey Correlation Degree andIt ’s Application in Evaluation of Water Quality Miyun Reservoir

First, a weight absolute grey correlation degree has been presented in this paper,based on the analysis of different computation method of absolute grey correlation degree which are widely used at present .The weight absolute grey correlation degree is simple method, and more advanced mathematical knowledge is not involved in. Meanwhile applied the method in the classical example and compared the results with the methods of ANN, Fuzzy integrative evaluation and grey clustering. The fact shows that the method put forward is convenient and feasible and useful. It was applied in evaluation water quality level of Miyun reservoir. Water quality of Miyun reservoir is in the second level has been concluded, which provides the base for management of Miyun reservoir.