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Aiming at the security problem of complex network nodes attacked, a method of resisting attack is proposed for subnet nodes based on Feistel algorithm in the simulation of complex networks. By means of the method of sub network node location parameter set, a malicious node location model, and determine the true positioning accuracy; then using Feistel algorithm of node ciphertext encrypted, and the encrypted information back into plaintext information, improve the anti attack method to simulate network nodes of complex networks to complete immediately. The results show that this method can not only locate the malicious nodes accurately, but also enhance the anti attack performance of nodes and improve the security of the network.