"Internet + " is a paradigm with disruptive innovation and brings rare opportunities for cross-border cooperation of libraries. On the basis of expounding the concept of libraries’ cross-border cooperation,this paper systematically combs the development course and research progress of libraries’ cross-border cooperation under the "Internet + " environment. At the same time,combining with the practice of libraries’ cross-border cooperation development,the paper deeply explores the paths and methods of libraries’ cross-border cooperation service innovation,analyzes the problems existing in the current practice of libraries’ cross-border cooperation,and puts forward some suggestions and measures to improve the development of libraries’ cross-border cooperation service.