Abstract: To investigate the physiological mechanism of exogenous abscisic acid（ABA）regulation of drought stress of ginger，the effects of active oxygen metabolism in ginger leaves applied ABA（0.05 mmol ? L-1）solution was studied with a ginger（Zingiber officinale Roscoe）cultivar‘Laiwu Ginger’by using the method of sand culture and 5% PEG simulating drought. The results showed that regardless of the water status，exogenous ABA significantly increased the content of endogenous ABA in ginger leaves，especially for the one under drought stress，meanwhile，exogenous ABA was found to be beneficial to holding relative water content in ginger leaves. At the early state of the application of exogenous ABA，the activities of superoxide dismutase（SOD），peroxidase（POD），catalase（CAT）were enhanced markedly，which significantly reduced the . productivity rate and H2O2 content and delayed the increase of MDA content，at the last state of the application of exogenous ABA，although theAbstract. activity of antioxidant enzyme in ginger leaves of ABA treatment decreased with the prolongation of treatment time，the level of reactive oxygen of ABA treatment was still significantly lower than those under single drought stress，so was the MDA content. The results suggested that exogenous 0.05 mmol ? L-1 ABA is favorable to maintain the active oxygen metabolism and decrease the level of membrane lipid peroxidation，which enhance the ability of resisting drought stress in ginger leaves.

Key words: ginger, ABA, drought stress, active oxygen metabolism, antioxidant enzyme