Abstract: To investigate the evolution characteristics of the frost jacking behavior of conical piles and their resistance mechanisms, a testing device for the anti-frost jacking performance of conical piles was developed. Unidirectional freezing tests on conical piles were conducted to analyze the effects of pile material, cone angle, soil moisture content around the pile, and freeze-thaw cycles on the frost jacking performance of conical piles. The anti-frost jacking mechanisms of conical piles were also discussed. It is indicated that under the same conditions, the frost jacking displacement of the pile decreases exponentially with the increase in cone angle. As the number of freeze-thaw cycles increases, the growth rate of frost jacking displacement for vertical piles increases in a semi-logarithmic manner, while changes in conical piles are not significant. The pile material has a significant impact on the frost jacking characteristics of conical piles, and the wooden pile may experience thawing extraction. During the unidirectional freezing process, the moisture within the soil surrounding the pile migrates upward from the bottom; the greater the initial moisture content, the more pronounced the migration, leading to larger frost jacking displacements. However, the effect of moisture content on frost jacking displacement is weaker than that of the cone angle. During the freezing process of the soil around the pile, the freezing depth increases, the tangential frost jacking force on the pile surface increases, and the normal frost jacking force gradually decreases from compressive stress to tensile stress. When these two forces exceed the tangential freezing strength of the soil and the ultimate normal tensile strength, frost jacking of the pile occurs. Considering the resistance to frost jacking, economic factors, and the protection of frozen soil, the cone angle of the anti- frost jacking conical pile should be designed to be between 7° and 9°, but the pile depth must also be taken into account.