It is stipulated that the height of guardrail shall not be less than 1050mm when it is less than 24m, and not less than 1 100mm when it is 24m and above (including medium and high-rise residential buildings). Balcony, veranda, indoor cloister, inner patio, master bedroom roof and outdoor stairs should be provided with protective railings, and fences of Huizun guardrail should be installed.