The Improved Matter Element Extension Evaluating Model and Application

Based on analysis of former matter element extension evaluating model, author points out the former model´s limitation that the model can not be used when observed data are bigger than the section field value in evaluation of water quality. Combining synthesis weights with approach degree, a new matter element extension evaluating model based on synthesis weights and approach degree is established. The model effectively overcomes former model´s limitation in evaluation of water quality. In the model, synthesis weights formed by the whole diversity weights and the local diversity weights commendably show indexes´ influence to evaluating results. The model is applied in the practical example and the results show that it is scientific and reasonable.