Bishwanath from USA travelling to nepal with Nepali passport

Hi, I am Nepali with USA Green card holder. I am travelling to nepal with nepali passport with following Itinerary. Do i need transit visa
China Eastern
Flight 768
01:40pm Tue, Aug 28 Take-off: San Francisco (SFO)
11:15pm Wed, Aug 29 Landing: Kunming (KMG)

Layover: 15h 5m (Long connection)

02:20pm Thu, Aug 30 Take-off: Kunming (KMG)
03:15pm Thu, Aug 30 Landing: Kathmandu (KTM)