In order to study the soil water and salt movement rule of cotton field of drip irrigation under mulch in non-growth period in the process of freezing and thawing in northern Xinjiang，the paper carried out monitoring test about water, salt and temperature in Shihezi.The results showed that air temperature has a great influence on soil temperature.With the increase of soil depth,the temperature each soil layer gradually decreases.The impact of temperature on each soil layer gradually becomes smaller.In the early stage of freezing, the soil moisture each layer increases with the increase of depth,water is mainly concentrated in 40 ~ 100 cm soil layer,salt mainly distributes in 80 to 100 cm soil layer . In the stage of freezing,the change of water is bigger than that of salt,salt are mostly concentrated in 100 cm layer.In melting period,due to the influence of multiple freeze-thaw, the change of soil moisture content is relatively large, while the salt of 10 ~ 80cm layer changes little. The salt of 80 to 100cm layer accumulates relatively large.Through a winter,salt is mainly distributed in soil layer of 80 to 100 cm.