针对现有模型中只用节点度来构建蠕虫网络的不足,文中结合无标度网络性质和实际P2P网络通信的特点,引入一个表示新节点连接概率的调节参数,在此基础上以随机选择与优先依附混合的方式建立蠕虫传播模型,并利用平均场理论和Matlab仿真对模型的演化机理进行研究.理论分析与仿真实验表明：选择蠕虫网络中合适的节点和新感染蠕虫主机建立的连接与连接概率、节点吸引力等因素有着紧密的联系;所建立的蠕虫网络具有无标度网络的性质.

In order to overcome the shortcomings of the existing models that use only the node degree distruibution to construct the worm network,a worm propagation model with both random and preferential attachments is proposed,which considers both the property of scale-free network and the characteristics of real P2P network communication,and introduces a adjustment parameter representing the new node connection probability.Then,the evolution mechanism of the model is investigated based on the mean-field theory through Matlab simulation.Theoretical and simulated results show that the connection between the suitable nodes selected from the worm network and the newly-infected host is tightly related to the connection probability and the node attraction,and that the established worm network is scale-free.