[@aonly9470]
As just a roleplay, sure, I don't see any reason why anyone would say no.

Logically speaking, though, I'm curious- why would Australia form an alliance with China? Atm, China's actually been a rising country, in terms of power and strength. Their military has been growing stronger, their political power has been growing, their economic might has been expanding. Many parts of their country is somewhat third-world, and yet other parts are very modern. Decades in the future, China could become a superpower to rival America or Russia. The same could be said for South Korea and India. 

Meanwhile, Australia isn't too terribly prominently, globally speaking. Australia would gain quite a bit with an alliance with China, and China honestly wouldn't gain much- and no one likes making deals with people who aren't really friends (there's practically no major international dealings between Australia and China, that I know of) and don't really benefit themselves. 

If China were to ally themselves with someone, I'd say it'd be Japan, or South Korea (provided that there are still two Koreas, and America+South Korea didn't fall to North Korea- SK actually has US support), India, and maybe Russia. Australia's out of the way, without much power.