Do I need Chinese Visa if I have two layovers in China .

Hi I travel with my Turkish passport and I am planning to fly from San Francisco to Nepal . I found a ticket which is with two layovers in China .first The plane is going to Shanghai and then Kunming and the last stop is Kathmandu. My question is should I get Chinese Visa for domestic flight or no . I will be in China no more than 24 hours. And all flights are with Chinese eastern airways. Thanks a lot