This study analyzes the phenomenon of code-switching in broadcasting used by announcers at Three FM Radio. The researcher applied a descriptive qualitative method. To gain the data, the she recorded speech utterances of two announcers using a USB that were directly connected to LG MDD64 Audio Player as a recorder device. Then, she transcribed the conversation into the written form based on transcription convention by Ali (2000). In addition, the researcher analyzed the code switching that occured in the data and classified them into six functions of code switching based on Appel and Musyken theory (1987). The result of this study showed that all of the six functions mentioned by Appel and Musyken (1987) were applicable in Three FM radio and metalinguistics function took place as the most function occured, with expressive, phatic and poetic functions as the least function used by these announcers.