Core upgrade contents: First, car size specification, clarifying the minimum inner size of wheelchair-adapted car is 1.4m×1.6m, clear door width ≥0.9m, with a dedicated wheelchair parking area reserved; Second, control panel optimization, low-level control panel installation height 0.9-1.1m, button diameter ≥20mm, braille mark protrusion height 0.2-0.3mm, located on the side of the button; Third, information prompt upgrade, mandatory voice station announcement + synchronous subtitle display, adjustable volume, sound and light double alarm in emergency; Fourth, safety protection, three sides of the car are equipped with non-slip handrails with height 0.85-0.9m, non-slip floor without height difference, anti-pinch door opening and closing time ≥3 seconds; Fifth, transformation requirements, in-service elevators in public buildings such as hospitals, schools, and shopping malls must complete barrier-free transformation before 2027, and those not up to standard cannot pass annual inspection.