[Objective] The objective of the study is to reveal the freezing and thawing characteristics of the mixed soil and its effect on wind erosion and to provide a theoretical basis for the sustainability of the Mu Us sandland reclamation.[Methods] Taking mixed soil with soft rock and sand as the research object and sand as a control

the paper explored the differences in the freezing-layer formation

freezing-thawing processes and the snowpack melting of the two types of soil using meteorological data and soil and water content data of Yuyang District of Yulin City

Shaanxi Province.[Results] Due to the differences in water content

difference exists in the formations of the freezing layers between the two soils. Sandy soil was usually formed in dry layer and frozen under the surface while the mixed soil is frozen at the surface. The maximum frozen depth of mixed soil was 116.0 cm

deeper than that of the sand(96.0 cm)

and the freezing thawing time was a week later than the sand. When covered with snow

the surface of sand has 1.0 to 6.4 cm dry layer while the surface of mixed soil did not has. The snow coverage and thickness of mixed soil were greater than the sand

especially on the sunny slope.[Conclusion] Frozen soil layer and the snow could form two protective layers on the surface of mixed soil

and therefore reduce the wind erosion during the fallow period.