The compatibility of Ba(OH)2•8H2O with aluminum alloy and copper after 50 heating cycles was studied using SEM and high power X-ray diffraction technique. Analyze the effect of temperature on thermal stability. The results show that Ba(OH)2•8H2O has some corrosion resistance to aluminum alloys and is similar with copper. The Ba(OH)2•8H2O/foam copper phase transition composites were prepared by a simple vacuum adsorption filling method. The experimental process of phase change energy storage device with and without copper foam was established, and the continuous heat transfer and transformation of Ba(OH)2•8H2O/foam copper phase change composites were carried out at room temperature. The results show that compared with pure Ba(OH)2•8H2O, Ba(OH)2•8H2O/foam copper phase converter has faster heat transfer and better thermal conductivity, effectively reducing the supercooling effect of Ba(OH)2•8H2O. Heat transfer experiment at high temperature shows that the heat capacity of Ba(OH)2•8H2O/foam copper phase changes with the increase of temperature. When the temperature of the zone is higher than the material phase changes in temperature, some insulation measures should be taken for phase shifting components.