A laboratory study was carried out to investigate the heat moisture transfer and frost heave characteristics of a composite geofoam under artificial frost condition. The geofoam was composed of expanded polystyrene(EPS) beads, waste foundry sand, water and cement in proper proportions.Thermal gradients were loaded through the geofoam by maintaining the temperature of -5℃, -10℃ or -15℃ at the top and 10℃ at the bottom of cylindrical samples. Test results show that with increasing use level of EPS beads, the thermo physical properties of the geofoam are improved, i.e., thermal resistance enhances, freezing rate and depth decrease. The addition of EPS bead also leads to the reduction of frost heave, which helps mitigate freeze thaw impact on the geofoam. EPS bead content of 0.5%1.0%(by mass) is considered as a favorable range to enhance the anti frost performance of the composite geofoam. The anti frost performance of the geofoam is related to the thermal isolation, hydrophobic and mechanical buffering properties of the EPS beads.