With the serious shortage of water resource in Manas River Basin in an arid area, Haloxy lno ammodendron, windproof and dune-fixing plant s are often irrigated by groundwater which contains comparatively high salinity.Three salinity brackish water(1g/L､3g/L､6g/L) were adopted to irrigate the Haloxylno ammodendron, which has grown two years.The conclusion is that the comparatively high salinity brackish water has remarkable effect on the physiological activity and growth rate of Haloxylno ammodendron, when the salinity of irrigation water increased from 1g/L to 6g/L, the transpiration rate and photosynthetic rate respectively decreased to20% and35%.Under the full irrigation condition, the growth rate of Haloxylno ammodendron decreased with the increase of irrigation water salinity.During the fastest-growing period, the height of plant, the length of branch and the growth rate of crown diameter respectively decreased 51%､52%､52% by comparing with irrigation water salinity 1g/L.While the irrigation water salinity increased from1g/L to6g/L, the consumption water within each mature period of Haloxylno ammodendron has a descent trend.The total consumption water during the mature period decreased by 22.1%.This research will provide theoretical and practical references for using water resource and ecological protection in arid areas.