In 2018，short video has rapidly become a new platform for the transformation and upgrading of governmental new media by virtue of governmental communication. With the information ecology theory，this paper constructs the content ecology of governmental short video including content production，organization，communication，consumption，operation and regulation from the dynamic perspective，and then constructs the content ecological evaluation system of governmental short video on this basis. Through the content analysis of 147 short video of 49 governmental Dou-yin symbols，it is found that the governmental departments take an active role，the original hot style frequently appears，the government short video advantage appears. Governmental short video become an important platform of positive energy communication，but there are many aspects still in the exploratory stage，e.g. positioning and function，communication mode，interaction，characteristics，collaboration. This paper proposes to cultivate high-quality content，highlight the “local” scene；improve visual literacy，optimize user experience；strengthen interactive communication，enhance user stickiness；cross-platform linkage，give play to the matrix resultant force；strict supervision，appropriate incentives.