Abstract: Through automatic control, FPSO mild steel arm mooring lubrication control system can realize the forced injection of grease to each lubrication point of mooring system for lubrication, which plays a decisive role in maintaining the integrity of single point equipment, process stability and personnel safety. The FPSO mild steel arm mooring lubrication system in Bohai has been running for nearly ten years. Due to the lack of functions and poor stability of the original equipment, many problems need to be solved. In order to improve the stability of equipment and process, the lubrication control system was studied and a scheme of upgrading the lubrication control system was put forward. After the lubrication system was upgraded and put into use, the existing equipment safety hazards, production process hazards and personnel safety hazards were solved. This paper mainly introduces the idea of mooring system lubrication system upgrade, hardware selection and related software configuration, which can be used for reference by other similar systems and equipment.