Fourteen indexes were used to apply basic parameter estimation,principal component analysis and cluster analysis,based on 15 maize inbred lines at seedling emergence stage. The results showed that 14 indexes were classified into 4 principal components,which the contribution rate of physiological indexes and main root length was highest,accounted for 38. 7%. 15 maize inbred lines were classified into 3 groups according to drought resistance coefficient by cluster analysis. The consistency between principal c...