In order to reduce the damage caused by temperature during the transportation of the products, the paraffin-octanoic acid/graphite phase change material was prepared and its properties were investigated. Its performance was analyzed through thermophysical experiments, including differential scanning calorimetry and TEMPOS thermal characteristics, were used to analyze its performance. Six kinds of paraffin and octanoic acid with different mass ratios were prepared. The paraffin-n-octanoic acid with a mass ratio of 0.2∶0.8 reached the eutectic point, with a phase transition potential of 161.31 J/g and a phase transition temperature of 13.4 ℃. The thermal conductivity of paraffin-octanoic acid with a mass ratio of 0.2∶0.8 was improved by adding different contents of graphite. It was found that the thermal conductivity increased by 3.9 times and cycle stability became good when the graphite content was 20%. Considering three aspects such as phase transition potential, phase transition temperature and thermal conductivity, the conclusion is that the best paraffin-octanoic acid/graphite phase change material can be obtained by adding 20% graphite to the paraffin-octanoic acid/graphite phase change material with a mass ratio of 0.2∶0.8, which can meet the requirements of transportation environment of 10-20 ℃.