Heat exchange will occur in the process of carbon dioxide pipeline transportation. The temperature of a certain substance per unit mass increases (decreases) by 1 ℃, and the heat absorbed (released) is called the specific heat capacity of the substance. The amount of heat exchanged has a great relationship with the specific heat capacity of the transmission medium. Therefore, studying the change of specific heat capacity of carbon dioxide has great practical significance for studying the law of carbon dioxide pipeline transportation. Hysys is used to simulate the change of specific heat capacity of pure carbon dioxide with temperature and pressure,,