Abstract: In order to promote the application of Paraisometrum millense in arid areas, this study investigated the changes of plant morphology and some physiological indexes of P.mileense under five drought stress treatments after spraying ABA and the correlation of various physiological indexes.The effects of exogenous ABA on the growth of P.mileense under drought stress were analyzed.The results showed that the wilting degree of P.mileense treated with drought was alleviated after spraying ABA,and there were still some green leaves.The relative electrical conductivity, malondialdehyde（MDA）,proline（Pro） and soluble sugar（SS） contents were significantly lower than those of drought treatment（P＜0.05）.After rewatering, the leaves of the plant returned to stretch, soft and bright green, and the relative conductivity, MDA and Pro contents were not significantly different from those of the control.However, the SS content was different.After spraying ABA and rewatering, the SS content of plants returned to the control treatment level.The SS content of plants without ABA spraying was significantly higher than that of the control and other treatments（P＜0.05）.MDA was significantly positively correlated with proline and relative conductivity, and the relative conductivity was also significantly positively correlated with proline.That is, the increase of relative conductivity of P.mileense was accompanied by a large increase in the content of malondialdehyde and proline.In conclusion, P.mileense has strong drought resistance.Spraying ABA can not only prolong the green leaf period and improve the drought resistance, but also promote the rapid return to green and restore the ornamental.