This paper studies China’s short-video in the mobile internet era in 2019 from four parts，including overview，focus，problems and trends. Overall，in 2019，the short-video user market maintained growth；the commercialization accelerated in an all-round way；the platform competitive landscape was stabilizing and the game of DOU and KUAI was upgrading；the content growth slowed down and moved in a diversified and order direction. Focusing on the industry，there were three distinct features：the abrupt rise of content e-commerce，the overall sinking of the user market，the grow-up of local Vlog. However，scattered and fragmented MCNs which were in false prosperity，and the problems of false advertising and data fraud under the highly commercialization damaged the development of short video industry in 2019. Looking forward to 2020，systematic construction around short- video e-commerce will become the focus of business，and specialized and refined content on targeted markets will release greater value.