Buildnetwork worm propagation model and analyze the impact of factors to network worm propagation process, is an important aspect of network worm propagation mechanism.ln this paper, based on the classical simple epidemic model(SEM), the change of thenumber of hosts in one day inthe prior network worm propagation model is often ignored.Study the factor of possiblepotential impact of network worm propagation and proposeDP-SEM, thensimulatedby MATLAB. The simulation results show that, DP-SEM ismoreaccurately reflects the network worm propagationthan SEM model.%准确地建立网络蠕虫传播模型，合理地分析影响网络蠕虫传播过程的多种因素，是目前网络蠕虫传播机制研究的重要内容之一。本文在经典的简单传染病模型SEM的基础上，引入脆弱性主机数量的日常变化（DiurnalPattern）这个在之前的网络蠕虫传播模型中通常被忽略的因素。深入研究其对于网络蠕虫的传播过程可能产生的潜在影响，提出DP-SEM网络蠕虫传播模型，并利用MATLAB对DP—SEM模型进行了模拟验证。模拟结果表明，通过合理地分析脆弱性主机数量的日常变化，DP—SEM模型可以比SEM模型更加准确地反映网络蠕虫的传播过程。
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