Xinjiang has a vast area of the saline soil,where the cultivation of salt-tolerant wheat using saline water for irrigation is of great significance to exploitation of the resources.Soil samples were collected by season from randomly chosen stationary sampling sites for analysis of salt contents in lab to study tempo-spatial variation of soil salinity of the soil.The results display that the soil salinity of the soil,5~12 g/kg in soil salinity,has been reduced as a result of frequent irrigation with saline water.The effect is more significant especially when the fields are deep plowed exposing the soil to insolation before irrigation in summer.Significance of the reduction of soil salinity has nothing to do with the original salt content of the soil.The variation of soil salinity may reach as deep as 100 cm,but is significant only at the surface layer.