This study aims at describing the use of language at primary schools grade 1, 2, and 3 in Surakarta. The study belongs to descriptive qualitative research. It emphasizes in a note which depict real situation to support data presentation. Content analysis is used as research methodology. It analyzes the research result of the observed speech event. The data are collected from three sources: informant, events, and documents. Results of the study demonstrate that the use of Javanese language is still dominant in the learning process at primary schools in Surakarta. Many factors affect the use of Javanese language as mother tongue in classroom teaching-learning process. They are (1) balancing the learning process, so that learners are able to better understand the material presented by the teacher (2) teacher's habit to speak Javanese language, and (3) drawing student's attention. The factors underlying this phenomenon are explained by teacher and student's lack of Indonesian language vocabulary. In addition, there is an element unnoticed by teachers.