Abstract: For clarifying the effect of irrigation on distribution characteristics of soil water and salinity and extending scope of root in condition of different distance of emitter , different irrigated years and different forest age, open country monitoring method, was used this paper carried out the comparison test in Kalamiji oasis in the lower reaches of Tarim River, northwest of China. The results showed that: the growth of forestry root was not hampered under the present irrigation schedule, but the root distribution moved up under the drip irrigation. This paper proposed that: production in the future, narrow distance of emitter could been use in most recent several years planter which may leach salinity apparently; Although the effect depth of drip irrigation in previous three years basically has not hindered the root growth of Elaeagnus angustifolia and the more years of irrigation the deeper of leaching depth following the age of forest, the leaching scope where the shelter forest root extending is partial, the suggestion spate flooding irrigation once a year.