Abstract: The propane dehydrogenation (PDH) to propylene is a new process for the production of propylene. In order to reduce the energy consumption of PHD plant, the heat exchanger network of propane dehydrogenation plant is analyzed and optimized by using pinch technology. The whole process model of PDH plant is established based on the actual operation parameters, from which the properties of hot and cold streams involved in the heat exchange are obtained. The problems of the old heat exchanger network are found out and the energy saving optimization scheme is proposed using pinch technology. And the optimization scheme is simulated and calculated. The simulation results show that the optimization scheme is reasonable and may save energy.