Improvisation is an oral activity that the host has improvised in front of the microphone,using broadcast television as the medium.It is precisely because of this,the relationship between improvisational and unscripted broadcast is very close.Therefore,oral improvisation puts forward very high requirements of host's impromptu expression capacity,the ability to deal with all kinds of unexpected situation and site information processing must reach a certain degree in order to meet the needs of the improvisational oral hosting.This paper starts from the importance of improvisation oral expression course in the training of presenter in broadcasting,and tries to elaborate on the teaching mode and teaching method in the teaching of the oral improvisation expression course in the background of the media in the whole media era.It hopes that this research can make some contribution to the development of Chinese oral improvisation expression teaching.