Abstract: In view of the phenomenon of load transfer and capacity constraints in the connection edges between different networks in reality, a cascading failure model of interdependent networks considering dependent side loads is proposed and applied to the subway bus dependent networks to analyze the load distribution problem caused by the transfer between different transportation networks. In this model, the failure of dependent edge load, failure of dependent nodes and loss of non-maximum connected subgraph are comprehensively considered. By adjusting the attack ratio, this paper analyzes the influence of different load redistribution strategies, different network coupling modes and combination modes, the degree of network dependence and different edge attack modes on the robustness of interdependent networks. The results show that the residual capacity allocation strategy can effectively alleviate the overload failure of dependent edges, and the robustness of interdependent networks composed of small-world networks is better. The robustness of model decreases as the proportion of dependency node increases and increases as the redundancy of dependency increases. Improving the coupling degree and the average degree of sub-networks can effectively improve the invulnerability of interdependent networks. Compared with connected edges, attacking dependent edges has a greater impact on the robustness of networks.