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Thanks nelsona.

But why the gov said as long as accompany the Canadian citizen oversea, the status is still valid? I read the travel doc instruction, and it said I could apply one if return canada as long as submit the original landing paper?

And I hope this issue is not related to the transit ...

I have US green card. And 10 years ago, I have landing paper (not maple card) of Canada. Now I live in US with my spouse who is Canadian Citizen. I didn't apply maple card but I think my immigration status is still valid.

Now I need take a flight which will have one stop at Vancouver for 3 hours ...