With the rapid development of the Internet, more and more consumer behavior has been embedded in the virtual networks, so the information from Internet took increasingly the impact on consumer behavior. This paper, from the perspective of attribution theory, using experimental research methods, analyses the main effects of eWOM publishing various platforms on consumer causal inference and product judgment, and examines the moderating role of the valence of eWOM on the platforms and consumer product judgment relationship. Finally, it discusses the ideas and strategy of disseminating marketing information through the Internet.