Under drought conditio n, the characteristics of water phy siology , photosynthetic rate and grow th of Hippophae
rhamnoides L.w ere analysed.The results showed:( 1) I n dry season, leaves of Hippophae rhamnoides L .can keep
hig her relative w ater content, big critical saturation deficiency , higher bound wa ter content and bigger ratio of bound water to free water, weak transpiration intensity , low leaf water potential ;( 2) U nder the condition of droug ht, transpiration intensity of Hippophae rhamnoides L.weakens, photosy nthetic rate goes dow n, it can keep ex uberant vitality and normal g rowth through adjusting by water itself .but chang e rang e of transpiration intensity is bigger than that of pho tosy nthetic rate for changing of water conditio n;( 3) T he way for drought-resistance of Hippophae rhamnoides L. belong s to typical dry-hardiness, and under the condition of drought, it reduces water consumption throug h transpiration intensity, w hich implies it has the characteristic of keeping out drought .This is the comprehensive reflection of dryresistance fo rmed by lo ng-term adapting the habitat of semiarid loess hilly region, and makes it has strong er capability of droug ht-resistance.These are impor tant to fo restation and drought-resistant variety breeding of Hippophae rhamnoides L.