Based on the principle of objectivity, in order to reduce the relevance of variables, this part adopts the principal component analysis method to convert 7 indicator variables into highly generalized new variables to reflect the social economic environment characteristics of each county (city). After importing the above seven socio-economic environmental indicators into the spssl9.0 version for principal component analysis, the test results of KMO and Bartleet are obtained. The test results are shown in Table 4 and Table 5: