Since the rise of WeMedia platforms the threshold of information communicator has declined rapidly, and the interactive communication of multiple risk subjects has become the basic communication context. In this new context, the amplification phenomenon of risk on social media provides a new complexity worthy of indepth discussion for the theory of “social amplification of risk”.Among them, agenda rivalry and discourse competition have become two important mechanisms of WeMedia in regards to risk amplification.

risk communication; WeMedia; agenda; discourse