Abstract: With the arrival of the omnimedia era, the audience's identity has been reconstructed. The lowering of the threshold of information dissemination allows the public to truly participate in the dissemination of information. Geographic information, as a branch of information, is bound to change in the tide of the omnimedia era. From the perspective of dissemination, we first analyze the changes of geographic information dissemination mode.Secondly based on the dissemination theory of information, a de-centralized and radiation diffusion dissemination mode in the omnimedia era is constructed. Then combined with the characteristics of omnimedia, this paper studies the dissemination characteristics of geographic information from the aspects of communication subject, content, form, audience and mode.And we finally study the current situation and existing problems of geographic information communication.

Key words: omnimedia, geographical information, de-centralization, radiation diffusion mode, dissemination mode