This study aimed at identifying the effective traits for the teacher at Yarmouk University as perceived by students in lights of some variables, and whether their estimations differ according to their sex, college and educational level. The study sample consisted of 1020 students (440 males and 580 females). A scale of 45 items was developed to measure three dimensions: planning and teaching, class management and personal traits. The results of the study demonstrated that students give high importance to all traits of the teacher, and that the dimension of the personal traits obtained the first rank, followed by class management and finally by the dimension of planning and teaching. The study results also revealed statistical significance differences of the students\' sex on the whole scale and on the subscale of planning and teaching, while there were no statistical significant differences on the whole scale or the subscales as related to students\' college or educational level.