Abstract: Aspen Hysys software and Pipeflo software were used to simulate the heat recovery utilization of production water by increasing heat exchanger on platform in an oilfield of South China Sea. Heating the liquid from upstream by the heat from production water will reduce the pressure loss of the subsea pipeline, and reduce the pressure and electricity consumption of the transfer pump. But it can also increase the temperature of the transmission to the processing terminal HYSY 115 FPSO and lower the power of the terminal heater. Reducing pump pressure and terminal heater power can save a lot of electric energy, thus reducing the production cost of crude oil.