Abstract: The rise of social networks profoundly affects the development and direction of public opinion.This paper starts with “Shifang Event” as an example, by the way of quantitative statistics and qualitative analysis of its occurrence and development of the social network relating speech.Afterwards, an analysis is made based on general growth pattern of social networks.There are four stages: the formation and diffusion of central topic, topic audience’s aggregation and differentiation, opinion leaders and their confrontation, opinion attenuation and regression.Based on these results, a fundamental strategy is put forward, which effectively guides network public opinion and propels its benign interaction with public opinion.