This research aimed to be know the type of code mixing, the dominant type of
code mixing and the reasons why the lecturers used code mixing in teaching
speaking for beginner level at STKIP PGRI SIDOARJO. This research
methodology that used in this research was descriptive qualitative method. The
subjects of this research were English lecturer that teach speaking for beginner
level at STKIP PGRI Sidoarjo. This research used observation and interview in
collecting the data. The result showed that there were three types of code mixing
that used by English Lecturer in teaching Speaking for Beginner Level, namely
Intra Sentential Code Mixing, Intra Lexical Code Mixing,and Involving Change
of Pronunciation. Intra Sentential Code Mixing was the dominant type that often
used by English Lecturer in Teaching S peaking for Beginner Level,which is 16
utterances included Intra Sentential Code Mixing,1 utterances included Intra
Lexical Code Mixing,1 utterances included Involving Change of Pronunciation,
while the reason is repetition used clarification and inserting sentence fillers or
sentence conectors