Based on the good compatibility of long-chain alkyl groups, three eutectic phase change materials (IS-LC, OC-LC and OC-LC-HD) were prepared by melt blending with eicosane (IS), octadecane (OC), lauric acid (LC) and hexadecanol (HD). The optimum mass ratio of eutectic points was calculated by Schr?der formula, and was determined as m(IS):m(LC) = 0.61:0.39, m(OC):m(LC) = 0.74:0.26 and m(OC):m(LC): m(HD) = 0.61:0.21:0.18, combing the results of step-cooling curve and differential scanning calorimeter (DSC) analysis. The eutectic temperatures are 30.2, 25.4, 22.6 ℃, respectively, which are consist with the theoretical calculation results. The chemical structure, crystallization behavior, heat storage capacity, and thermal stability of eutectic phase change materials were characterized by Fourier transform infrared spectrometer (FTIR), X-ray diffractometer (XRD), thermogravimetric analyzer (TGA) and DSC. The results show that three eutectic phase change materials are combined by physical interaction without chemical reaction. The phase transition temperatures are between 18~32 ℃ and lower than any single component. The phase transition enthalpy values are greater than 180 J/g, The eutectic phase change materials has good thermal stability and cycle stability.