This article picks 12 hot domestic public events and the corresponding internet buzzwords from 2010 to 2014 as samples. Adopting the method of crisp-set qualitative comparative analysis, it analyzes the micro-mechanism of the wide spread of buzzwords. Some variables have impact on the spread, including the nature of the event, the subjects who create buzzwords, the ways of emotional expression of buzzwords, the facts whether buzzwords are adopted by mainstream media, the emotion that buzzwords convey and the facts whether buzzwords contain public appeals. This study finds three micro-paths that can explain this phenomenon: buzzwords are created spontaneously by a person concerned and taken into the official field of discourse in a playful way; in a political event buzzwords are created by the public to convey dissatisfaction and demands with ridicule; or fabricated by the public to convey dissatisfaction and taken into the official field of discourse. Buzzwords under these three circumstances are likely to be spread widely.