On one hand, based on the hot-discussed concept of "water army", we introduce the concept of" water topic", and indentify the phenomenon of pure pursuit of commercial interests and speculation topics with the help of the diffusion map. 一方面,基于日前热议的网络水军概念,引入水话题的概念,结合话题传播图,对纯粹追求商业利益的营销和炒作性话题传播现象进行识别。