In order to solve deformation problems such as seasonal frost and sinking of highways in the northwest saline earth region, the temperature and humidity of the G215 line willow garden to Dunhuang Expressway foundation, the temperature and humidity in the ternate is analyzed. Change law. On this basis, the interior non-hydrating freeze-thaty test was carried out, and the deformation characteristics of chloroflite soil were analyzed. The results show that during the year monitoring period, the temperature sensitive depth of the ground soil is 85 cm, and the water content in the 25~85 cm depth inland basis is high. In the indoor freeze-thating cycle test, the salt-containing amount of soil-containing frost is greater than that of the integrated deformation, the volume accumulation is maximum; the soil sample volume increase rate of 95% is 1.14%, which is more than 85%. The compactive soil sample is 0.7%, the larger the compaction, the soil-free deformation is greater than the integration deformation, the amount of the soil sample volume has correlation with the compaction size; the moisture content is 19.32% soil sample volume. The increase rate is 7.70%, compared to 27.32% aqueous content of 7.44%, and the soil-containing melting deformation of small water content is smaller than the frosty deformation, and the amount of soil samples is negatively correlated with water content. The results of the study can provide reference for the disease analysis of highways in the saline earth.