ABSTRACT The purpose of this research is to increase the students’ learning activeness and achievment trought the implementation of STAD cooperative learning on limit function at XIth grade IPA 2 SMAN 1 Kuripan in the academic year of 2021/2022. The kind of this research was a classroom action research (CAR) which was conducted in two cycles. Each cycle includes planning, acting, observation, evaluation and reflection. The research subjects were the students of XIth grade IPA 2 consisting of 25 students; 14 females and 11 males. The result showed that students’ activeness scores in cycle I for each meeting were 9,33 and 9,98 categorized less active and active, while in the cycle II for each meeting were 10.33, and 10.66 categorized as active . The everage score was 66.2 and the presentage of classical completeness was 68% for the cycle I and the everage score was 70.88 and the presentage of classical completeness was 80% for the cycle II. The conclusion was the implementation of STAD learning could increase the students’ learning activeness and achievement on limit funtion at XIth grade IPA 2 SMAN 1 Kuripan in the academic year of 2021/2022.