Abstract: The thesis analyzed the propagation model of worm in detail and the model was optimized. We presented a new propagation model of worm named as the QSIRV propagation model based on the Two-Factor propagation model.The model reasonably considers the failure of the immunity. The experimental results show the QSIRV model can better descript the worm propagation and the interaction between the worms spread of network traffic and worms flow, and especially the simulation of the changed number of the host immune is consistent with the actual situation, and the model also considers the influence for isolation, immune, number of infected hosts and the people vigilance to worm. The paper further improved the QSIRV model. The improved model can faster resist the worms spread.

Key words: Worm,Propagation model of worm,Optimization of model,QSIRV model,Distributed worm detection