The interaction of teachers and students in the classroom in the Indonesian Senior High School 2 Baubau Is a research in the study of discourse studies, namely spoken discourse. This study aims to: 1. Describe and explain the structure of the teacher's oral and students in the class in the teaching and learning process, 2. Describe and explain the functions of language in teacher and student acts, 3. Mendeskripikan and explained that spoken discourse particles in teacher and student interactions in the classroom during the teaching and learning process. The research of oral discourse analysis between teachers and students is qualitative research, namely conducting research on the background natural or context from a integrity, the researcher himself or with the help of others to collect the main data. This research is descriptive, because the data collected is in the form of oral speech that occurs when the interaction of the teacher and students in the classroom. This research is also an analysis of the contents which are a research technique to describe the contents of communication that are clearly objective, systematic and qualitative. Data in this study is the verbal speech of teaching and learning interaction in the classroom between teachers and students observed, recorded and recorded and described in the form of text. The data source is three Indonesian teachers and students in class. The analysis of the spoken discourse of teacher interactions and students in the class, regarding what will be analyzed is: 1. The discourse structure in the class to be analyzed using Sinclair and Coultrad theory, there are 21 speech acts according to the structure, 2. The analysis of language functions in spoken discourse interactions using the MAK Haliday and 3 theory. Regarding oral discourse particles using the theory stated by Stubs via Linke, Nussbaumer, Portmann. Data collection techniques using read and proficient techniques. Based on the results of the analysis and discussion, it can be concluded that the interactions of teachers and students in the refer class of the compressive exchange pattern, although the results for oral discourse structure can be seen that teachers still dominate in interacting in the class, students can speak if there is an opportunity given by the teacher or want to convey something. In addition, communicative languages make it easier to deliver information both teachers and students. The characteristics of spoken discourse in class are marked by a context outside the speech of teachers who quite influence their speech meaning such as: place, time, atmosphere, subject, topic, purpose and tone of speech. The form of teacher tongue discourse and students in class is also determined by the language functions used by both teachers and students in general, language functions are used as a communication tool. The results show language function as: 1. Instrumental function, 2. Regulatory function, 3. Representation function, 4. The interaction function, 5. Individual functions, 6. Heuristic and 7 functions. Imaginative functions. Imaginative functions are not discovered during research, because these functions are often used in literary works. Particles are essential in oral interaction, especially during conversation change, in the analysis of teacher and student interactions in the classroom, several particles used by both teachers and students when communicating, these particles are as follows: 1. Tegun form, 2. Forms of reduction in exchange rate, 3. Opening talks, 4. Speaker's cues, 5. Partner cues spoke, 6. Greeting, 7. Greeting, 8. Call, 9. Acceptance and 10. Rejection