The purpose of the study was to investigate the effects of teachers' expectation on their students' grades of mathematics and deportment. The subjects were four class of 205 students of first and second grader in a junior high school and four teachers who taught the classes. 　　All students were rated by the teachers in terms of their expectation on students' mathematics and deportment. The achievement motivation test, the self-expectation rating scale, and the intelligent test were administered to the students. 　　The main findings of the study were as follows: 1. If the intelligence factor was controlled, high-teacher expectation group got significantly higher score than the low-expectation group in mathematics grades. 2. Teacher expectation on students' mathematics grade were significantly correlated with the students' depostment grades. 3. Teacher expectation and student self-expectation in mathmatics grades and depostment grades were significantly correlated.