Core contents of the standard: First, standardized risk assessment methods, unifying the risk assessment methods and processes for in-service escalators and moving walks, and clarifying the risk level classification standards; Second, clear safety transformation measures, formulating corresponding safety transformation measures and technical requirements for different levels of risks; Third, graded management by service life, dividing equipment into three grades according to service life, and clarifying the frequency and content of safety inspections for each grade; Fourth, safety component upgrade requirements, specifying the upgrade and transformation requirements for safety components of old equipment, including handrails, steps, brakes, safety protection devices, etc.; Fifth, unified acceptance standards, unifying the acceptance items, methods and judgment standards after safety transformation.