The study analyzes Korean language in the broadcasting media of Jeju and reviews mistakes frequently made, which are also found in that of other regions. Several common mistakes are discussed in depth with examples. Journalists engaged in the broadcasting media of Jeju should root out a tendency to follow incorrect usage of the language in a nationwide broadcast without due consideration. Journalists in broadcasting should make efforts to pronounce words correctly. This study reviews common mistakes in broadcasting, which are not consistent with the rules of Korean phonetics and orthography. Prevalent mistakes are as follows: indistinction between short and long sounds, incorrect application of fortis and lenis sounds and mispronunciation of words to which the rules of assimilation and addition should be applied. This implies journalists should pay particular attention to correct usage of Korean language.