Due to human negligence, technical problems or other reasons. In the process of inputting children's vaccination information files, if the operator does not check the information carefully or there is a system failure, it will lead to input errors. If the information file of children's vaccination is entered incorrectly, parents can bring their children's vaccination certificate to the community health service center or township health center where the children's vaccination file is established for correction. The staff will check the information on the vaccination certificate and make corresponding amendments to ensure that the vaccination records of children are accurate. This is to ensure the health of children and the effectiveness of disease prevention, and also to facilitate the follow-up vaccination management and monitoring.