C certificate of safety officer is also called C certificate of three types of personnel in construction enterprises and C certificate of three types of personnel. Safety officer C certificate is a full-time safety production management personnel of construction enterprises, which refers to the personnel engaged in safety production management in enterprises, including the person in charge of the enterprise safety production management organization and its staff and the full-time safety production management personnel at the construction site. If the three types of personnel pass the examination, the construction department will issue a certificate of safety production examination, and the certificate of the three types of personnel is common throughout the country.

According to the national safety production law, safety officers do a good job in daily supervision, inspection, inspection, training, rectification, prevention, dust removal and cleaning, safety inspection, fire prevention, theft prevention and poisoning prevention, equipment maintenance and management, safety tips, etc. in stations, automobiles, supermarkets, hospitals, schools, enterprises, meeting places, entrances and exits or elevators. Team leaders and operators should hold relevant certificates and do regular and irregular work.