Because the input fingerprint is not recognized, apply for card replacement. The "ruthless" law enforcers of punch cards make office workers "miserable". Among them, the reason for applying for a card punching machine in the library can be that the fingerprint is not recognized and the card is changed. A library is an institution that collects, sorts out and collects books and materials for people to read and refer to. As early as 3000 BC, libraries appeared. Library has the functions of preserving human cultural heritage, developing information resources and participating in social education.