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The purpose of the experiment was to explore the feature on grayscale of CT images during frozen soil thawing. Siltyclay sample was taken into isothermal air (20 °C) to melt by natural convection after being frozen at -27 °C, and the CT images were obtained by X-ray scan, at the same time, its temperature-time history was recorded. The curve of grayscale-time was acquired by counted CT images at each moment, and compared with its temperature-time history. The results show that the average grayscale increases obviously with temperature rising and thawing in frozen soil. However, after sample thaws completely, the average grayscale is not practically changing even temperature still rising. A break point is obviously observed in the graph of grayscale-time at the moment of phase-ransition finished, which is considered as a symbol of frozen soil melting complete. [ABSTRACT FROM AUTHOR]