Abstract: [Purpose/Significance] In the current digital era, it is an important task for academic libraries to establish the security systems of digital academic resources. In China, academic libraries that play a supporting role are an important force in constructing such security systems. They play a supporting role in the middle level of the whole security system. [Method/Process] The author investigated libraries of "Project 211" universities by literature review to study the acquisition cost of information resources, information resources service modes and the construction of digital resources. Then the author summarized the characteristics and put forward promotion strategies. [Results/Conclusions] The total acquisition cost of information resources of academic libraries that play a supporting role has kept risen steadily and slightly. The acquisition cost of electronic resources has risen sharply, while that of paper resources has been decreasing. These libraries are able to provide basic information resources, but their service modes need to be expanded. In the development of digital humanities collection resources, they need to apply key technologies and use the humanistic ideas. The paper puts forward that these academic libraries can improve themselves from five aspects: formulating policies, developing related technologies, constructing related resources, developing related services, and carrying out cooperation.

Key words: supporting academic libraries, digital academic resources, digital humanities, information resources development