The limited space operation mentioned in the Safety Regulations for Limited Space Operation in Industry and Trade Enterprises refers to the operation carried out by personnel entering the limited space. Official website, emergency management bureau of Hangzhou, introduced that a confined space refers to a closed or partially closed space, which is not designed as a fixed workplace, and is likely to cause accumulation of toxic, harmful, flammable and explosive substances or insufficient oxygen content. Confined space operation refers to the operation carried out by the personnel who enter the confined space. The main person in charge of an industrial and commercial enterprise is the first person responsible for the safety of confined space operations, and shall organize the formulation of a safety management system for confined space operations, and clarify the responsibilities of the approvers, guardians and operators of confined space operations, as well as the requirements for safety training, operation approval, protective equipment, emergency rescue equipment, operating procedures and emergency disposal.