Abstract: Constructing the information ecological balance mechanism that adapts to the smart library’s development is of great significance to maintain the balance, stability and order of the information ecosystem and to promote the healthy, harmonious and sustainable development of the new generation of smart libraries. The information ecological balance mechanism of the smart library should be guided by the concept of intelligent perception, observe the principles of “concept innovation, process coordination,adaptation regulation, intelligent optimization”, constitute the basic elements including macroscopic planning and supervision mechanism, the information organization leading mechanism, the information symmetry and feedback mechanism, intelligent management service mechanism, intelligent prediction and risk resolution mechanism and adaptive response optimization mechanism. It should build an operation system where the subject, the demand and the action are effectively correlated, so as to enhance the selfadjusting, self-balancing and emergency response capability.