[Purpose/significance] A consensus has been reached on the development of library, information and archives subject under the background of new liberal arts.It is beneficial to the implementation of consensus to discussthe specific landing plan and operation path of library, information and archives subject reform from the micro operation level.[Method/process] This paper puts forward the concept of“micro major”and explains its connotation andcharacteristics.Combined with the development characteristics of library, information and archives subject under thebackground of new liberal arts, this paper takes the“micro major”of data governance as an example to study its construction significance, target positioning, graduation requirements, curriculum system, organization and managementmode. [Result/conclusion] It is believed that the“micro major”of data governance is a feasible way to update the connotation of library and information archives subject under the background of new liberal arts, is the“seed”of cultivating new liberal arts specialty, and is the“factor”of cross-penetration of library and information archives subject to other subject and major.It can provide reference for the construction practice of other“micro major”in the field of library,information and archives subject.