Core revision contents: first, maintenance personnel qualifications, maintenance personnel must hold special equipment operation certificates, retrain every 3 years, maintenance personnel for high-speed elevators/medical elevators need to add specialized training; second, refined maintenance items, grade-based maintenance items are formulated according to equipment type, speed, service life, adding three items: energy consumption monitoring, component health evaluation, remote diagnosis; third, preventive maintenance (PM), formulate personalized PM plans based on equipment operation data (start-stop times, fault frequency, component wear degree), fault early warning rate ≥90%; fourth, record specification, maintenance records must include on-site photos, detection data, rectification status, adopt electronic files, which can be traced to the full life cycle; fifth, escalator special requirements, add comb plate gap monitoring, step chain tension detection, anti-pinch device verification, ensuring public place safety. After implementation, the consistency of maintenance quality is improved by 60%, reducing accidents caused by improper maintenance