Abstract: Objective]The field cultivated biennial seedlings of sweet kernel No.1 and No.2,bitter kernel No.1 and No.2,4 types of wild apricot (Armeniaca vulgaris Lam.),which were collected from Ili re-gion of Xinjiang were used for this experiment,26 d of drought stress treatment was performed in order to in-vestigate the adaptive traits of photosynthesis of wild apricot under water stress conditions.[Method]The 5 th and 26 th days of interception of water,the photosynthetic rate,stomatal conductance,intercellular CO2 con-centration and the transpiration rate were measured,and the water use efficiency was calculated,meanwhile the water potential,cell membrane permeability and the chlorophyll contents were determined.[Result]The a-daptive change of water potential and the cell membrane permeability were related to the stress resistance,the range ability of net photosynthetic rate different between the types of wild apricot,the order of range ability as:sweet kernel No.1 >sweet kernel No.2 >bitter kernel No.1 >Bitter kernel No.2.[Conclusion]The de-crease of net photosynthetic rate be resulted both from stomatal and non-stomatal factors in wild apricot,and the contribution of stomatal and non -stomatal to decrease in photosynthetic rate was different between the types of wild apricot.The changes of chlorophyll a/b ratio and the water use efficiency were correlated to the variability of net photosynthetic rate.