This research aims to describe and to explain the Language Use in Elementary School
Students at State Elementary School (SDN) 15 Sempalai Tebas, Tebas Sub District,
Sambas Regency, West Kalimantan. This research restricted its scope to: 1) The form
of the language variety students use, 2) The form of mixing code and switching code
students use, and 3) The effect of language use in Elementary School Students to the
Indonesian language learning process. This research is focus on field research by
using the descriptive method with sociolinguistic approach. The data in this research
is come from the language use in elementary school students, from oral language that
used in the inside and outside classroom. The subject of research was taken using
purposive sampling technique, collecting data used direct observation and indepth
interview. After ward analyzed by using identity method. The form of language variety
catagorized in to tree of basic code specifically Indonesian language (BI), Malay
language with Sambas Dialect (BMDS), and Chinese Language with Hakka Dialect
(BTDK). All three of these languages have their respective roles in daily
communication in SDN 15 Sempalai Tebas. Some form of mixing code including code
mixing in word form, clause, frase, baster, repeated word, intern mixing code, and
extern mixing code. The occurrence of switching code is caused by several factors: the
speaker, the audient or listenner, the presence of a third speaker, the change of
discussion topics. Results of the analysis showed language using in elementary school
students in SDN 15 have negatives impact to Indonesian language lerning process in
elementary school students.