the purpose of this study was to determine the effectiveness of cooperative -mastery learning of a ten-week on basketball skills and moral reasoning at physical education lessons in (30) prep school female students. The sample were randomly divided into experimental (n=15) and control (n=15) groups. At the beginning and end of the study performance, tests and the Moral Judgment Test were applied. The results revealed that the experimental group exhibited statistically greater learning and mastery basketball skills and moral reasoning compared to the control group. These findings indicate that the cooperative-mastery learning model should be considered when teaching students to successfully psychomotor skills and to promotion moral reasoning