The cascading failure processes of interdependent networks under several intentional attack strategies were studied.The simulation results show that comparing with the strategies that only consider the connectivity of nodes in one single network,the attack strategies will be more effective when the connectivity of nodes in both networks are taken into account simultaneously and the interdependent networks will seem more vulnerable.The study may be helpful for the understanding of cascading failures of interdependent networks,and can provide some helpful suggestions for the protection of interdependent networks under attacks.