At the Bank of China, you need to bring your valid ID card to change US dollars into Australian dollars, and at the Bank of China, you need to change US dollars into Australian dollars:

1. If you want to exchange cash, you must go to the bank counter to exchange it. You need to bring your valid ID card to the counter to fill out the application for purchasing foreign exchange.

2. If the money is in the card, you can exchange it at the ATM first, and then go directly to the bank counter to withdraw it.

3. Purchase of foreign exchange through online banking: log in to online banking, select investment and wealth management, click settlement and sale of foreign exchange, select RMB to purchase foreign exchange, and then withdraw cash from the bank.