Unattended substations in oil and gas fields play a key role in the whole production process.In order to ensure the management system is suitable for the actual operation requirements,it is necessary to upgrade the system,in order to be adapt to different working environment and production conditions.The reconstruction of computer integrated automation system for unattended substations in oil and gas fields is introduced,which is the main solution for unattended substations,can optimize and complete in the system function and the performance,makes the due contribution to the safety and the stable production.