The research objectives are outlined: 1) to find out the types of teacher’s reinforcement. 2) to understand the impact of teacher’s reinforcement on students’ performance. A qualitative method with a case study design was employed. The subjects of the research were an English teacher and her students in the second year of SMKN Tapango. The data was analyzed using thematic analysis. The finding of the research shows that the teacher’s reinforcement used by the teacher were praising Students’ answers, appreciating students’ positive behavior, showing an attention the students, respecting students’ effort, providing fun and challenging activity and rewarding students’ task. Furthermore, the impact of teacher’s reinforcement were developing students’ behavior including students’ motivation and students’ confidence and impact on students’ learning achievement. In conclusion, the teacher used some types of the teacher’s reinforcement in the class and it has impact on students’ behavior and student’s achievement.
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