Abstract: Cascading failures in complex networks is of great significance for the stability assessment of complex networks. Based on the classical linear load and capacity model, a model resisting cascading failures is built by detecting the community structure of the networks and adding secondary tolerance value to community boundary nodes. In the process of cascading failures, different strategies are used to attack IEEE standard grids, domestic real grids. The simulation results show that the model can raise networks stability with lower cost by adding secondary tolerance value to community boundary nodes, finding that the community boundary nodes have the dual functions of "firewall" and "tipping point". By simulating the two-tier coupled networks except for single networks, the new model is also found abler to resist cascading failures in interdependent networks, which indicates that the proposed model has some flexibility.