Abstract: A briefly review about the interdependent networks is given in this article. The concept and models of interdependent networks are introduced. The failure of nodes in one network may trigger cascading failures and catastrophic consequences. According to the topology of the system, the existing empirical research on the robustness of interdependent networks is reviewed from four aspects: the systems with one-to-one connection relationship, the systems with multiple dependencies, the systems of networks, and the scale-free networks. The existing methods for enhancing network robustness are given. At last, the research on interdependent networks is briefly summarized.