Not sure what visa I need with stops in Shanghai and Kunmig during transit only

I'm not sure what type qualifications will apply. I depart Mon, 17 Oct from Los Angeles USA (LAX) Arrive 18 Oct Shanghai (PVG) with 1h 45m stop Shanghai (PVG), Then Shanghai (PVG) to Kunming (KMG) with 3h 10m stop in Kunming (KMG) before Kunming (KMG) to Kathmandu Nepal.

Return is Kathmandu Nepal 8 Nov to Kunming (KMG) with 10h 25m stop in Kunming (KMG), then Kunming (KMG) to Shanghai (PVG) 9 Nov with 2h 30m stop in Shanghai (PVG) before going Shanghai (PVG) to Los Angeles USA (LAX)