To solve the problem of soil heat accumulation in the heat exchange process of energy piles， this research combined the advantages of phase change concrete and traditional energy piles， and the phase change material （steel ball） is mixed into concrete to form a phase change energy pile （PCEP） to improve the heat exchange efficiency and heat storage capacity of the energy pile. Then， the thermodynamic characteristics model test and simulation of PCEP in saturated sand were carried out， and the parameters， including the pile temperature and the temperature of the soil around the pile， axial strain in the pile， and pile top displacement under cyclic temperature load， were measured. The results show that the strain in the PCEP is lower than that of the ordinary pile after heating up， and the strain in the PCEP is close to that of the ordinary pile when the temperature is stable. The temperature lag effect and thermal stability of the PCEP are better， and the heat transfer efficiency is higher than that of ordinary piles， which helps alleviate the problem of soil thermal accumulation. The long-term cycle temperature of the pile is too high （50 ℃ during the day and 40 ℃ at night）， and the temperature in the pile exceeds the phase change temperature of the phase change material， so the energy storage effect becomes poor. An intermittent working environment is needed to achieve the best behavior in practice.