Firstly, through theoretical analysis, it is concluded that ice thickness is mainly related to cold water velocity, it is found that the inlet temperature of cold water has little influence on the total heat transfer coefficient and icing condition within the experimental range, while the inlet flow of cold water has a greater influence on the ice sheet, and the growth rate of the ice sheet accelerates with the increase of the discharge. Finally, the optimal heat transfer efficiency condition within the experimental range is obtained through numerical simulation, and the analysis shows that the influence of cold water inlet flow on the ice sheet is significantly greater than that of the inlet water temperature, and the decrease of both will lead to the increase of the overall thickness of the ice sheet, but the decrease of the flow will increase the growth rate of the ice sheet. The study of phase changer heat exchanger not only lays a foundation for optimizing the deicing device, but also for improving the heat transfer efficiency of phase changer heat pump system.