GB/T 3908-1983 stipulates the size standard of 80 columns of perforated paper cards for information processing. The standard specifies the length, width, thickness and other Dimensions of the card in detail, as well as the key parameters specifications such as perforation position and aperture. It unifies the size specification of 80 columns of perforated paper cards in the field of information processing. It provides basic technical guidelines for the production and manufacture of perforated paper cards, equipment adaptation and information storage and processing, and ensures the accuracy and compatibility of data processing.