On the basis of the original campus one card, Pujiang College of Nanjing University of Technology has expanded the smart door locks in dormitories. Not only can cards and passwords be used to open the door, but also the perfect campus scanning code can be used to open the door. This non-contact recognition method, combined with the virtual campus one card, allows teachers and students to complete identity authentication, electronic payment and other functions through mobile phones on campus, further improving convenience.