The physiological and photosynthetic indexes of 2-year-old seedling of Camellia oleifera clones including Changlin 4(C₄),Changlin 23(C₂₃) and Changlin 53(C₅₃) were measured under different gradients sustainable drought stress in greenhouse,and then the drought resistance was comprehensively evaluated by correlation analysis,principal component analysis and subordinative function.The results showed that:(1)As the drought stress proceeding,the relative electric conductivity and TBARS content were increasing.(2)The activities of SOD and POD increased at first,and then decreased.The antioxidant enzyme activities were the highest after drought stress for 15 d.(3)Chlorophyll content,net photosynthetic rate,stomatal conductance and transpiration rate in leaves of C.oleifera were decreased in various degrees.(4)The order of drought tolerance was Changlin 53>Changlin 4>Changlin 23,which was accordance with the damaged symptom of C.oleifera after drought stress.