Abstract: A microencapsulated phase change material(PCM)was prepared by the in-situ polymerization method using low melting point paraffin and melamine-urea-formaldehyde prepolymer as core material and shell material respectively.Through optimization by orthogonal test, 94.15% paraffin was encapsulated and the microcapsule containing 61.78% paraffin was prepared successfully.Differential scanning calorimeter(DSC) was used to study the thermal properties of the microencapsulated PCM, and the results showed that the melt point and enthalpy were 12.53℃ and 137.16 J·g^-1, respectively.In addition,the hydrophilic-lipophilic properties of the microencapsulated phase change material was also investigated with the Washburn equation, and the result showed that the hydrophilicity of the PCM reduced with increasing content of paraffin in the PCM.