-- You mean H1B visa stamp on your hubby's passport bah?
If so, this doesn't matter. Chinese citizens usually get 3-month H1B visa stamp on the passport.
When will your hubby's H1B status expire?
I got a new H1B visa stamp at the US Consulate in Toronto. Then used the new visa stamp to come back to US this time. Very easy.
But I used an old I-94, 797, with an expired H1B visa stamp on my passport to come back from Canada last year. It's easy. Nothing to worry.
If you are really worried, your hubby can go to the US Consulate in Canada to get a new visa stamp.