Pupils use social security cards.

Legal analysis: A kind of medical welfare provided by the state, which aims to guarantee the medical expenses such as hospitalization, treatment and surgery for minor children suffering from certain diseases reported by insurance. Children's social security can provide children with the most basic medical security, such as the settlement of outpatient medical expenses, the protection of congenital diseases and past diseases.

Legal basis: Article 57 of the Social Insurance Law of People's Republic of China (PRC) stipulates that the employing unit shall, within 30 days from the date of its establishment, apply to the local social insurance agency for social insurance registration with its business license, registration certificate or unit seal. The social insurance agency shall, within fifteen days from the date of receiving the application, examine and issue the social insurance registration certificate.

Where the social insurance registration items of the employing unit are changed or the employing unit is terminated according to law, it shall, within 30 days from the date of change or termination, go to the social insurance agency to handle the change or cancellation of social insurance registration.

The administrative department for industry and commerce, the civil affairs department and the organization management organ shall promptly notify the social insurance agency of the establishment and termination of the employing unit, and the public security organ shall promptly notify the social insurance agency of the birth, death, household registration, transfer and cancellation of an individual.