The validity period of safety production supervision and law enforcement certificate, coal mine safety supervision and law enforcement certificate and safety qualification certificate is 3 years. If it is really necessary to extend the validity period, it shall apply to the original issuing department for extension 30 days before the expiration of the validity period. The assessment and certification of special operations personnel shall be carried out in accordance with the Management Regulations on Safety Technology Training and Assessment of Special Operations Personnel. The special operation certificate and safety qualification certificate issued by provincial safety production supervision and management departments and provincial coal mine safety training and supervision institutions are valid nationwide.