This research intends to analysis the types of code-mixing in Banten employed by 2nd grade students SMAN 2 Kota Serang, know factors used code-mixing, reasons code-mixing. The mixed method was used. To obtain data observation, questionnaire, and interview were employed. result showed all XI MIPA 4 code mixing. mixing morphemes, word, modifiers, phrase, clause, sentences. doing participation rol...