1. Bank: You can exchange Hong Kong dollars at the bank counter or self-service equipment. Generally speaking, large domestic banks provide Hong Kong dollar exchange services, and the exchange rate is relatively favorable.

2. Currency exchange machines: You can also find some currency exchange machines in some commercial areas or airports, railway stations and other places, and you can exchange Hong Kong dollars directly through RMB.

3. Online exchange: In addition, you can exchange Hong Kong dollars through some online financial platforms or foreign exchange trading platforms.

No matter which method you choose, it is recommended to know the current exchange rate before exchange and pay attention to choosing a formal and reliable exchange institution or platform. In addition, we should also pay attention to the protection of personal and property safety in the exchange process.