The aim for this research is to analyses the change on the level of teacher self-efficacy perception of preservice teachers' who take classroom management course. The study was carried out at the Technical Faculty of Education in the Department of Electronic and Computer Education at Gazi University in the second term of 2006-2007 academic years. Totally 91 teacher candidates constitute sample of the research. The research design of the study was pre-experimental type that included one group pretest and posttest model has been applied. Before the Study, teacher's efficacy sense of scale with a 94 reliability coefficiency had been applied as pretests. The scale includes total 24 points on the dimensions of student engagement. instructional strategies and classroom management. After a 12-week classroom management course, the same scale had been applied as posttest. Arithmetic mean, dependent t-test and independent t-test were applied for analyzing data. Effect sizes correlation coefficient was also calculated. At the end of this research, it was determined that teacher candidates' teacher self efficacy perception level after and before they took courses changed positively. On the other hand, the study demonstrated no statistically significant gender, general academic achievement levels and high school type they graduated differences in the teacher sense of self efficacy levels of preservice teachers'.