Abstract: In order to discuss redundant capacity of nodes against load, this paper proposes a cascading failure model of complex networks considering overloaded nodes. Firstly, the cascading failure model is constructed according to the overloaded coefficient, failure probability and residual coefficient. Then, based on the characteristics of nodes, the load distribution strategies of the overloaded nodes are proposed. Finally, under cascading failure, invulnerability is simulated in BA scalefree network. The results show that in the load distribution strategies of the overloaded nodes, the mixed distribution strategy is better on the whole, which can significantly control cascading failure and increase the invulnerability; to a certain extent, raising the overloaded coefficient and distribution coefficient is helpful to reduce the impact of cascading failure, while this is not effective when both are large; and the invulnerability gets enhanced, when the residual coefficient is a certain value.