This paper aimed at the university admission ratio changes, and chose per capita GDP, per capita education index, per capita national investment in education, school and teacher number five factors as explanatory variables, using the software of SAS obtained the fitting equation that the heteroscedasticity, autocorrelation, multicollinearity proved that can be used.Aiming the significant of influence of various factors, the paper used the visual analysismethod in orthogonal experimental design to determine the optimal combination of factor levels, and used the analysis of variance to discuss significant of factors, and lastly determined the combination of factors sustain the biggest university entrance proportion, and then analyze the combination of the largest influence on China???s college enrollment ratio, and to promote the management of students.
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