This article mainly focuses on the refined inspection and maintenance management of mechanical and electrical equipment in refining enterprises.Through in-depth analysis of the entire process of defect handling,a data chain based defect handling management method has been designed.This method includes three core modules:process reengineering,data chain management,and problem management,which achieve complete input,summary,analysis,and display of various information in the defect handling process.These process data not only provide a solid foundation for refined equipment management,but also provide comprehensive and accurate data support for enterprise digital transformation,and inject strong momentum into ensuring the stable,reliable,and efficient operation of the equipment.