Abstract：For frozen Lanzhou sandy soil and loess at the K0DCF test mode，it is found that the stress-strain curves are similar to ideal rigid plastic ones under unloading，but the stress-strain curves of sandy soil and loess are different in the sections of K0 consolidation. The yield strength increases linearly with increment of confining pressure and decrement of temperature. The yield strength of frozen loess is obviously larger than that of the frozen sandy soil. The failure strain also increases linearly with confining pressure. With decrement of temperature，for frozen sandy soil，the failure strain decreases，while for frozen loess，the failure strain increases gradually.
