Abstract: With the gradual advancement of digital transformation of China Southern Power Grid, information quality is the basis to ensure the reliable operation of smart substation. Aiming at current problems of low information quality, low analysis and control level of the secondary system of smart substation, this paper studies the information governance system of smart substation under the digital transformation environment. Specifically, this paper sorts out the information content and information governance requirements of smart substation, constructs an information governance architecture for each stage of digital transformation, and puts forward the overall solution of information governance of smart substation. This paper practically explores the information governance system and methods of smart substation under the digital transformation environment, and supports the stable and efficient implementation of the company's digital strategic transformation.