the main means of daily control of catering cash income is document control. Therefore, special emphasis should be placed on "single interlocking, interlocking". The cashier will take the contents of UnionPay from the menu and type them into the cash register (if there is no cash register, the bill will be issued), print out the menu, and attach UnionPay to it, and discharge it in the order of counter numbers, waiting for the guests to check out. If the guest adds more food or drinks, the cashier takes the unionpay with menu from the waiter, then types in the cash register and prints the above contents.