The aim of the study is to investigate 3 yearly variations on body fat, BMI, and some anthropometric measurements of children in the different socio-economic status. Longitudinal survey including tree yearly measurements was used. Totally 397 children (192 female, 205 male) participated in this study Weight, height, some skinfold thickness (triceps, biceps, subscapula, calf and suprailliac), some diameter (biacromion, femur, humerus, biiliac), some circumference (biceps, femur, calf) was measured. Socio-economic status was determined according to settled area of school and level of income children's family. It was found that there was a significant difference in femur, humerus, biiliac diameters between girls and boys children at all years (p<0,01). In both girl and boys who have low and high socio-economic status, there were significant differences between first and second and third years measurements (p<0,01). Conclusions: Both girls and boys in the high socio-economic status have fatter and higher values of BMI and % body fat than both girls and boys in the low socio-economic status. (C) 2013 The Authors Published by Elsevier Ltd.