Abstract:  The main purpose of offshore oil platform to set emergency shutdown system is, under accident conditions, to shut down the process system to protect the platform staff and engineering facilities, so as to prevent pollution and reduce the loss of the accident to the minimum. The conventional design of the emergency shutdown system defines four off levels. When production shutdown is triggered, the whole production platform is shut down, which ensures the safety of personnel and production platform, but shutting down equipment will also lower the platform production. Aiming at this problem, logic optimization of the emergency shutdown system is carried out. It is proposed to close the emergency shutdown system of certain equipment in the premise of ensuring the safety of personnel and platform to reduce the shut down equipment, improve platform output, and achieve cost-saving and efficiency-increasing.