Considering the part of the spread of public opinion of network, the paper analyzes the main influencing factors, build a system dynamics simulation model of diffusion mechanism of public opinion of network, through simulation, explores the diffusion regularity of public opinion of network. Using System Dynamics models, from a new perspective, it analyzes the relationship among impact factors, as well as force size and finds its diffusion law, providing a strong basis for control the diffusion and the effective guidance of public opinion of network.% 综合考虑网络舆情扩散的环节并对其主要影响因素进行了分析，构建了网络舆情扩散机制的系统动力学仿真模型，通过对模型仿真，探究了网络舆情扩散的规律。利用系统动力学建模可以从一个新的角度分析各影响因素之间的相互关系以及作用力大小并发现其扩散规律，从而为控制网络舆情扩散及有效引导舆情传播提供有力依据。
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