Taklimakan Desert region is known as its extremely rigorous natural conditions.Soil moisture loss is very serious because of its extremely strong evaporation.Under such conditions,the shelterbelt along the Trim Desert Highway is difficult to manage and protect,so water-saving and water-keeping of shelterbelt is imperative.In this study,one new type hydrophobic polymer named Guilspare~ is used to text the inhibition on soil evaporation.Results show that Guilspare~ can limit soil evaporation and maintain soil moisture,which is of great significance in shelterbelt for it can improve soil and plant hydrological environment.Firstly,Guilspare~can reduce soil evaporation obviously.The largest inhibition amount is 21.06 mm and the initial inhibition efficiency is about 70%.Secondly,in field evaporation experiment,water content within 5 cm of soil surface is affected largely by Guilspare~ and below 5 cm,it is affected relatively less.Thirdly,after irrigation,plant water potential is reduced gradually with Guilspare~ concentration increase and hydrological environment of plant is improved better.