Spherical shape of phase change materials(PCM) were prepared by using sodium acetate trihydrate as a latent heat storage medium and then encapsulated with PMMA and wax. Gelatin was used as an effective thickener to prevent undesirable phase separation and sodium pyrophosphate decahydrate was used as nucleator to decrease the degree of super-cooling in the thickened PCM. The optimal composition of PCM was 2wt% thickener and 2wt% nucleator. Spherical shape of PCM particles of 3-3.5 mm in diameter were continuously manufactured varing the effluent velocity of molten PCM from 1.3 to 1.8 ml/min. Tertiary coatings of PMMA-wax-PMMA onto the PCM particles obtained were performed to prevent the leakage of crystalline water and to improve the mechanical strength. Thickness of each layers were 0.03 m, 0.25 mm, and 0.4 mm. Freezing-thaw cycle test of the coated PCM particle was done using dodecane as heat transfer medium by the experimental apparatus and DSC.