The purpose of this study was to suggest the effect of educational program on physique and body composition in obese elementary school children. Thirty-five obese elementary school boys divided by 2 model groups such as experimental group(18boys), control group(17 boys) were adapted to perform the educational program with habits of physical activities and diet. We measured physique, and body composition. The Conclusion of this study was as follows: 1. Changes in physique 1) The measure of height in experimental group and controp group has been increased significantly by experimental term. 2) The measure of body weight in experimental group has not been changed significantly by educaional term. But the measure of body weigh in control group has been increased significantly by experimental term. 3) The measure of sitting height in experimental group and control group has been increased significantly by experimental term. 4) The measure of chest circumterence in experimental group and control group has been increased significantly by experimental term. 5) The measure of waist girths and hip girths in experimental group and control group has not been changed significantly by experimental term.