The aim of this study is to search core exercise's affect which is done regulary with female students for 8 weeks on students' balance programs. 20 volunteer female participants who were students of Osman Nuri Yalman High school (ten of them were experimental group and ten of them were control group) were included in the study. In the survey, experimental method with pretest-posttest desing was used. Core exercise was applied on experimental group three days a week during 8 weeks on the other hand no exercise was done with control group. SPSS (Ver.20) packet program was used while analyzing data statistically. Before the analysis, normality distribution was determined by being used skewness-kurtosis and hitogram and significance level was controlled according to the greenhouse-geisser and two-way repeated measures of anova values. According to the results of the survey, significant difference was found between two groups' pre-test--post-test balance values (F(2.69, 48.36) = 42.25, p < 0.05). The post-test balance values of the group in 8 directions increased significantly. When the pos-test balance values between the two groups were compared, the post- test balance values of the experimantal group participants were significantly higher than the control group participants (F(1.18) = 6.20, p < 0.05). Consequently; it can be said that core training applied to the high school level female students three days a week for 8 weeks can have a positive effect on balance performance.