Four mandates: First, video monitoring, HD monitoring in cars, 24-hour recording, backup power for power outage; Second, elevator insurance, liability insurance mandatory before regular inspection, no insurance no annual inspection; Third, IoT monitoring, install operation monitoring device, real-time data upload, automatic fault alarm; Fourth, credit supervision, maintenance unit credit rating, strict inspection and rectification for poor ratings; Fifth, retrofit subsidy, home-installed elevators included in "Two New" policies, dual support from national and local subsidies.