Salt-affected soils extensively distribute on the earth.Although the causes are various,generally speaking salinization occurrence results from the accumulation of free salts to an extent that causes degradation of vegetation and soils.Besides,irrational human practices have increased soil salinity by allowing excess recharging of groundwater to change the natural balance of the water cycle in the landscape. This reduces the suitability to plant growth and increases the potential for other forms of land degradation such as soil erosion and structural decline.Thus salinization is one of the most serious long-term threats to the sustainability of land and water resources in the world.Trees can tolerate a certain level of salinity thanks to their nature proper.Therefore in view of biological amelioration of salt-affected soil,planting trees is necessary and significant.After trees are established on the saline land,the watertable could decline through increasing discharge and decreasing recharge.Additionally total salt content could decrease,especially in soil surface profile and topsoil,and soil physical & chemical state could be improved. Salt-affected soils extensively distribute on the earth. Though the salient occurrences from the accumulation of free salts to an extent that causes degradation of vegetation and soils. Besides, irrational human practices have increased soil salinity by permits excess recharging of groundwater to change the natural balance of the water cycle in the landscape. This reduces the suitability to plant growth and increases the potential for other forms of land degradation such as soil erosion and structural decline. Thus salinization is one of the most serious long -term threats to the sustainability of land and water resources in the world.Trees can tolerate a certain level of salinity thanks to their nature proper. Here in view of biological amelioration of salt-affected soil, planting trees is necessary and significant. After trees are established on the saline land, the watertable could decline through increasing discharge and decreasing r echarge.Additionally total salt content could decrease, especially in soil surface profile and topsoil, and soil physical & chemical state could be improved.