concern about the visa from Shanghai>Kunming

Hi! If I travel from Canada to shanghai, transit from shanghai to kunming (because I have to go get my baggages then check in again), then kunming to vientiane (Laos).. Do I need to apply for visit in order to transit in china, because I'm Laos passport holder?
Toronto>Shanghai> (have to go to get my baggages outside and check-in again) Shanghai>Kunming>Kunming > Vientiane (Laos)
Thank
Amy