This application is a one-stop solution for restaurant ordering. There are three entrances, namely ordering, kitchen and checkout, corresponding to three roles, waiter, chef and cashier at the front desk. After opening the application, users can choose their own roles, the same device can change their own roles as well. When users select their own roles, they will enter the corresponding user interface and use the corresponding functions. The waiter role can add dishes, edit and delete dishes, add and delete dish types, place orders, query orders that have been placed according to different search conditions, and add dishes to orders that have already been placed. The back kitchen role can receive the order from the waiter, prepare the corresponding dishes on the order, add dishes to the existing order, send the completed order to the front desk cashier, and query the completed order, etc. The casher role can receive orders from the kitchen, check out and query completed historical bills, etc.