Abstract: In order to reveal the propagation regularity of worm and predict the scale of outbreak accurately，the propagation models of worm are researched by many experts and scholars.However，the existing propagation models can not reflect the spreading of worm correctly.Because these models ignores some factors which influence the propagation of worm.So the proposed model takes two important factors into account，defines the new infective rate and immunization rate and then presents a dynamic propagation model.One of the factors is the variety of bandwidth，the others is the variety of immunization.This model is developed based on the course of worm spreading.Finally，the experiments indicate that the model can simulated the worm propagation availably.

Key words: worm, infective rate, immunization rate, propagation model

摘要： 研究蠕虫病毒的传播模型是为了更好地揭示蠕虫传播的规律，预测蠕虫爆发的规模。由于对影响蠕虫传播的因素考虑得不够周详，现有的传播模型还不能很好地模拟蠕虫的传播。针对网络蠕虫的具体传播过程，提出一种模型将网络环境变化和用户免疫过程对蠕虫传播的影响考虑进来，定义了新的感染率函数和免疫率函数，提出了蠕虫传播的动态模型。仿真实验表明，该模型能够较好地预测蠕虫的传播，具有一定的有效性。

关键词: 蠕虫, 感染率, 免疫率, 传播模型