| By arranging 4 sampling sites in the Lijiang River Basin, the 2014 annual water quality data was collected for principal component analysis. Domestic sewage factor, agricultural runoff factor and industrial sewage factor were selected as pollution factors input to the linear structure model and their correlation was made. The results showed that the relationship between domestic sewage factor, agricultural runoff factor, industrial sewage factor and water quality pollution factors were 0.49,0.37,0.13, respectively, indicating that the water pollution in the Lijiang River Basin was mainly caused by domestic sewage, followed by the agricultural sewage. Put the population density, agricultural proportion, the proportion of industrial normalization of the 7 counties in the Lijing River Basin into water quality factor， the water quality evaluation index was obtained. Using GIS to analyze the spatial distribution and clustering relationship of population distribution and enterprise distribution in the Lijiang River Basin, there was a negative relationship between water quality and population distribution, enterprise distribution. |
