Perth Immigration I entered Australia with someone else's passport, and now I'm going back to China. Can I have my passport?

Yes, but the problem is that the Immigration Bureau will see that your passport has no entry record, and then find that you have stayed illegally. It's certainly no problem to return to China eventually (even if you don't return to China yourself, they will be repatriated).

But the problem is that it is almost impossible for you to enter Australia with your passport next time. Because you are already on Australia's entry blacklist.