The problem of traveling to Hong Kong with an Australian passport...

First of all, let me tell you that although your Chinese passport has not expired, it has automatically expired because you have been naturalized in Australia. Because mainland China does not recognize dual nationality. If you use a Chinese passport to enter mainland China, it is likely to be confiscated by the border inspection, and you may also be punished for using an expired document. So keep that Chinese passport as a souvenir. Similarly, because you are now an Australian, your ID card and household registration should also be canceled. If your household registration has not been canceled due to negligence in the public security work, you may be able to apply for it by chance, but if it is later discovered that you hold a pass but are not Chinese (with Chinese nationality), you are very likely to face penalties, whether in the mainland or Hong Kong.

Basically understand your planned itinerary. You will go to mainland China, then you want to go to Hong Kong (for example, for fun), then you want to go to mainland China again, and finally depart from the mainland and return to Australia. This is how it works Bar? It will definitely be no problem for your first trip to the Mainland or from the Mainland to Hong Kong. Then you can apply for a Chinese visa during your stay in Hong Kong and apply at the Office of the Central Government Commissioner in Hong Kong. In fact, China Travel Service (Hong Kong) can handle it for you. Generally, it is faster to apply for a Chinese visa in Hong Kong. After you arrive in Hong Kong, go to China Travel Services Hong Kong to apply for an agent. This is both legal and a solution to the problem. Remember to bring the required materials.