When the saline water ( < 3g / l ) infiltrated to 45cm , the top soil of 0 - 37cm was desalinized , when the saline water of 3g / l infiltrated , the desalinized depth was 0 - 15cm . moreover , sar of top soil increased with the sar of the infiltration water . 3 . through lab experiment , the characteristics of soil water and salt movement under different initial soil moisture content were analyzed 当湿润深度为45cm时,小于3g l的微咸水入渗后, 0 - 37cm土层处于脱盐状态,而3g l的微咸水入渗, 0 - 15cm土层处于脱盐状态, 15cm - 35cm土层含盐量基本等于初始含盐量,但湿润锋处含盐量很高。