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The aim of this study was to know the types of code mixing usage in conversation and the reasons behind the use of code mixing. This study was conducted to observe and analyze from the interaction in daily conversation of English lecturers. The method in this study was a descriptive qualitative research where the researcher used a description table as data because the researcher was required to examine the data from the conversation and properly explain the results of the data that had been collected. In this study, there were 3 types of code mixing used, namely insertion, alternation, and congruent lexicalization. Based on the data, there were 179 uses of code mixing in dialogue, 90 dialogues using insertion, 54 alternation and 35 congruent lexicalization. In addition the researcher found new code mixing namely repetition. The researcher also found out the reason why code mixing occurred in the conversation”. There are six reasons why code mixing happened they are bilingualism, speaker and partner speaking, social community, situation, vocabulary and prestige. Based on the data, the most common factor causes the code mixing is Social Community because people mix their languages when they are in the same community

bilingualism, code mixing, daily conversation