The aim of this study is to investigate the effect of 4MAT instruction method to students' affective characteristics about physics lessons. The experimental design of the study was semi-experimental design with pretest, post-test without control group. The sample of the study consisted of 32 girls and 33 boys, total 65 2nd grade high school students of two different schools in Ankara in 2010\2011 academic year. "Affective Characteristics Questionnaire About Physics" which was developed by Abak (2003) was used as pre-test before the application of the 4MAT instruction method. Then the subject of "work, power and energy" was taught to the study group for 8 weeks using 4MAT instruction method. After that, the instrument was applied as post-test. According to students' answers a significant difference was found in "physics student motivation", "self-concept in physics" and "self- efficiacy in physics" factors in favour of post-test scores.