The aim of this study is to determine the effect of computer assisted grammar teaching on the academic success of classroom teacher candidates. The study group consists of 2nd grade students from Karadeniz Technical University Fatih, Faculty of Education, Department of Classroom Teaching in the educational year of 2010 to 2011. Experimental pattern with pretest-posttest groups was applied in the study. The experimental and control groups were selected randomly. "Grammar Achievement Test" developed by the researcher was used as data collection tool in the study. The achievement test had 33 items. Data obtained were analyzed using statistical package for social sciences (SPSS) 16.0 software package. T-test method was used for independent groups and dependent groups in data analysis. At the end of the study, it was determined that there was an increase in the academic success of students both from the experimental and control groups in their grammar courses. However, it was ascertained that the increase in the academic success of students in the experimental group where the courses were given by the computer assisted teaching method was higher in comparison to students from the control group where courses were given by conventional teaching methods. (Contains 2 figures and 4 tables.)