According to the located observation for the artificial Haloxylon ammodendron forest in Northwest Xinjiang Wei Autonomous Region , we analyzed its ecological value and economic functions.Results indicate that the air current resistance of forest belt to close stratum may increase 1.2～6.6 times.Moreover , the wider the belt , the more notable the effect.The 130 m wide forest belt can block and intercept about 95 % of drift-sand.The observation shows that the better width of forest belt is more than 130 m in order to make drift-sand to be blocked and intercepted effectively in the oasis periphery.The inner temperature of forest belt has the closer correlations with its width and plant coverage degree , so there is an important significance to improve its inner air humidity by keeping forest belt with a certain coverage degree and width.