According to relevant regulations, the validity period of the certification certificate is generally three years, that is, the end time of the certification cycle. During the certification period, the certificate holder needs to conduct an annual audit in accordance with the regulations and submit the corresponding materials. If approved, the certificate will remain valid; The certificate will be cancelled if the audit is unqualified or fails to be audited as required. In order to ensure the validity and compliance of certificates, expired certificates need to be kept until the end of the certification period.