IM model of transmission of the virus structure on the scale-free network

The current real-time communications network faces a serious threat of the virus, in order to prevent it. We must study it in detail. In this paper, an instant messaging virus propagation model, which is focuses on the study of IM worms. About Instant Messaging (IM) worms on the network, we are mainly active exploration of it´s similarities and differences between the worm, also indicate the severity of IM worms. Lastly, on the IM worm propagation model, we first proposed in the following model assumptions and analysis of the parameters that will be used, and then the mathematical theory of the method by Lisan node infection rate of change is proved.