回复：加拿大移民：出生证明，结婚证，国内职称证明需要原件吗？

I believe they ask for the original documents according to the official instructions.

But you can try the photocopy. They will ask for original documents if they really need them. Something like the transcripts in China should be original.

If birth certificate and marriage certificate are in Chinese, you should have them notarized.