As a particular mechanism of land salinization, freeze-thaw action is differing from salification process by violent evaporation, it has distinct control action on springtime salification, but it has not been much accounted adequately. In the process of feezing and thawing,soil profile constitution is divided into three layers frozen layer, semi-frozen layer and unfrozen layer, special travel of water and salt was made.In the process of soil freezing, soil water and salt move towards fozen layer from the underlayers,salinity in the frozen layer increased evidently. In the process of soil thawing, the salinity of frozen ayer assembles in the upper soil layer along with violent vaporizing in springtime. Its intensity level of salification like“eruption”this time, the land salinization has no relation with ground water table, because frozen layer by way of waterproof layer insulate unconfined water. So it is unauthentic that the critical depth of unconfined water controlled that“eruption”salification in springtime.