<FONT face=Verdana>Complex network theory has provided the new train of thought and method to the research of malware's propagation. In this paper

against malicious software spread of the actual mechanism，we develop a new model

called the discrete probability susceptible-infectious (short for DP-SI)，which could be applied to any network topology. At the same time

the node information network model method have been proposed for investigating complex network simulations

provided an efficiency research flat for simulating of propagation dynamics in the cosmically complex network as well as building discrete propagation dynamics model. The results show that this model is closer to reality than the traditional model

and it has some significance in the control of malicious software.