Abstract: In order to investigate the freezing and thawing deformation, temperature field and moisture field changes under the artificial freezing conditions of typical red clay layer in Jiangxi area, this paper adopts the closed system one-way freezing and thawing test to study the remodeled red clay specimens under different freezing cold end temperature conditions, and obtain the freezing and thawing rate, thawing coefficient, freezing temperature field and moisture field changes. The test results show that:（1） the freezing and thawing displacement changes of the specimens can be divided into 7 stages during the unidirectional freezing and thawing process; the freezing and thawing coefficients decrease gradually with the decrease of the freezing cold end temperature, and the thawing coefficient is larger than the freezing rate; the lower the freezing cold end temperature, the shorter the freezing completion time, and the freezing completion time is exponentially related to the cold end temperature.（2） In the process of freezing soil samples, the lower the cold end temperature of the specimen, the higher the height of the freezing front, and the height of the freezing front is exponentially related to the freezing time.（3） The moisture field redistribution occurs in the specimen after one-way freezing and thawing in the closed system, the moisture content of the soil near the cold end of the specimen slightly increases, and the moisture content decreases by the warm end, the higher the temperature of the cold end of freezing, the greater the moisture migration, and the difference of moisture content change increases by 4.97% when the cold end temperature-5 ℃ compared with-15 ℃.