The card number on the health certificate is the number and code when handling the health certificate, which is generally located below the photo of the health certificate. The health certificate number consists of 10 digits. The first four digits are the number of the accepting institution, which consists of the last six digits of the number of the development zone or laboratory where the accepting institution is located, and the last five digits represent the personal number of the holder. The health certificate is valid for one year, and it needs to be re-examined and renewed before it expires.