Phase change materials based on UHMWPE blended with n-octadecane were studied in this paper. In addition, this paper reviews recent studies on the preparation of shape stabilized phase change materials (SSPCM), such as SSPCM from UHMWPE and n-octadecane, their basic properties and possible applications to latent heat storage. The preparation methods used were the melting methods. Shape stabilized PCM (SSPCM) prepared for FT-IR spectroscopy, SEM, DSC, XRD, and ARES results of the analysis for shape stability to improve heat capacity were identified. The optimum compounding conditions included a content of 40% n-octadecane. The SSPCM 40% demonstrated less deterioration of physical property and effective thermal property compared with other conditions. As a result, these SSPCMs could be said to be acceptable heat storage & release materials for various products.