Through experimenting on the loess by different freezing-thawing cycles,  the conclusions are drawn that the freezing-thawing cycle changes soil particle size. With the increase in the number of freezing-thawing cycles, fine particles in the soil increase, soil pores become larger, and the soil density become smaller, but the reduction is very small. The freezing-thawing cycle of the soil increases the soil coefficient of compression, and the compression modulus decreases.