[terkan]

I think both your parents have to be from Hk for you to get full citizenship. So if you're a halfer I don't think you get it because you aren't defined as a true "chinese national"

Article 5 Any person born abroad whose parents are both Chinese nationals or one of whose parents is a Chinese national shall have Chinese nationality. But a person whose parents are both Chinese nationals and have both settled abroad, or one of whose parents is a Chinese national and has settled abroad, and who has acquired foreign nationality at birth shall not have Chinese nationality.

So basically you're screwed.

you also have to renounce your canadian citizenship

Article 3 The People's Republic of China does not recognize dual nationality for any Chinese national.