Phase change materials(PCMs)have promising applications in fields of solar energy storage,energy conserving in buildings,thermal insulation and thermal regulation [1].In this study,n-octadecane/attapulgite composite phase change materials(PCMs)were prepared through vacuum infiltration method by using n-octadecane as phase change materials,attapulgite as supporting materials.Attapulgite possesses large specific surface area(143.2 m2/g)which can effectively absorb n-octadecane into its multiporous structure.Therefore,the obtained composite phase change materials have good thermal properties and excellent thermal cycling stability.The latent heat of the obtained samples can achieve 101.9 J/g with 50 wt%loading amount of n-octadecane.Moreover,the phase change temperature and latent heat of the sample can keep constant after 20 times of thermal cycling test.These results indicate that the prepared composite phase change materials possess excellent thermal stability and have a broad application prospect.