During the infodemic, the highly uncertain network public sentiment environment makes
the information diffusion mechanism from simplification to diversification, and the media field
changes accordingly. The uncontrollability of information has brought a great impact on the discourse
power of the mainstream media. In recent years, blockchain technology has begun to be used in the
field of Journalism and communication. Its decentralization, information traceability, openness and
transparency can generate great impetus for the improvement of the discourse power of mainstream
media. This paper first explores the generation logic of the discourse power of mainstream media.
At the same time, using blockchain technology as a trigger, it explores a feasible path to enhance the
discourse of declining mainstream media in the context of information epidemic from three aspects:
establishing trust network, innovating reporting content, and protecting content copyright.