Abstract：In cold regions，seasonal freezing and thawing are characterized by temperatures dropping slowly from positive to negative or rising slowly from negative to positive. However，the day-and-night freezing and thawing are characterized by fast temperature dropping and rising. Thus，it is very important to study the damage CT values of rock subjected to different freezing rates. The damage CT values of three kinds of Tongchuan sandstone are studied subjected to different freezing rates under open circumstances. Freezing and statistic frequency are used to analyze the characteristics of damage CT values，which can be referred to geotechnical engineering in the cold region.
