I am a nepali citizen and i plan to travel ULAN BATOR mangolia for official purpose .Due to rou

I am a nepali citizen and have to travel capital of mangolia ulan bator .The convinient route i find is via Kunming then to Beijing and to Ulan Bator .The return route is also the same .

Shall i need visa for two transit in China one in Kunming and Another in Beijing .

Please revert asap as i have to attend some official meetings...