Abstract：A brief review about multilayer networks research is given in this paper. The concept, theoretical model and data analysis of multilayer networks are introduced, which help us to draw scientific essence as well as pinpoint practical bottleneck and open questions in the future. As one of very important directions in network science, future studies of multilayer networks should focus on three aspects. First, for concept system, form a standardized and universal research paradigm. Second, develop the theoretical model to utilize the dependence and interaction of multilayer networks rather than sum of exiting models of single network. At last, in empirical research it is necessary to transit from verifying current model based on real data to improve real system via the theoretical model.
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