Abstract: The microcapsules containing high temperature phase change paraffin (Phase change interval is 75-85℃) was prepared by in situ polymerization using melamine modified urea-formaldehyde resin as wall material.Morphology,thermal properties of paraffin urea-formaldehyde (Paraffin-UF) microcapsules were characterized and analyzed by DSC,SEM,the coefficient of thermal conductivity meter.The influence of the NaCl solution,melamine and graphene for microcapsules was analyzed.The results show that the NaCl addition can improve the microcapsule surface morphology,and the addition of melamine can improve the production of microcapsules.While adding 0.03wt% mass fraction of graphene at 80℃,the coefficient of thermal conductivity of microcapsules is increased by 55.56%,and its thermal stability is improved.