The invention provides an accelerated playing method and device and a transmission and storage method and device of a media file. The accelerated playing method of the media file includes: acquiring key contents in text contents of the media file to be played in an accelerated manner; determining a media file corresponding to the key contents; and playing the determined media file. By applying the accelerated playing method of the media file, the key contents in the media file are retained while accelerated playing of media files of audio, video and the like is realized, and the integrity degree of media information is guaranteed; and transmission and storage of the media file can also be provided, and transmission requirements on network environment and storage space are reduced.