The certificate of safety officer is valid for three years. After the expiration, you need to participate in the continuing education and training organized by the local housing and urban-rural construction department. After the certificate of conformity, it can be extended. The policies in each region are different, so it is recommended to consult the local housing and construction department. The certificate of safety officer is valid for three years. Many friends in the construction industry will face such a problem. I got a safety officer certificate when I was free, and then I stopped being a safety officer. Then the certificate expired, and now you want to reuse it, you can postpone it. Safety officer 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 full-time safety production management personnel on the construction site.