This mobile application was developed by Xietuo Technology. It applies QR code technology to the access control system. Nowadays, everyone has a smartphone. In view of this, it is useful to develop a mobile app to replace the currently commonly used proximity card system. Its necessity not only improves the convenience of use, but also improves the security of the system. This app uses Xietuo Technology's original QR code encryption technology, which has absolute copy protection capabilities, and works with an exclusive QR code access control card reader. , can be seamlessly integrated into the company's access control computer connection management software, providing customers with an access control system that is easy to use and efficiently managed.