The relative water content (RWC), superoxide dismutase (SOD), peroxidase (POD), catalase (CAT), soluble protein, malondialdehyde (MDA) and proline (Pro) under drought stress at 20% PEG 6000 concentration were studied to explore the effect of drought stress on carnation seedlings and evaluate the drought resistance of 9 varieties of carnation.Based on the drought resistance index of these seven physical and chemical indexes, the principal component analysis and comprehensive evaluation of all varieties of carnation were carried out.The results showed that there were significant differences among the indexes of 9 carnation cultivars under water stress (P<0.05).Seven drought resistance indexes were classified into four principal components by principal component analysis, with the cumulative contribution rate of 84.46%. The drought resistance evaluated by the membership function method is in the order of ‘Master’, ‘Tess’, ‘Royal’, ‘Violet’, ‘Flame’, ‘Pink Love’, ‘Mallow Titanium Alloy’, ‘Pink Superior’, ‘Freedom’.