To make a comparison the cardiac structure between the endurance and the muscular training in young male athletes, 20 male subjects were recorded by supersonic cardiac recorder. Subjects were divided 3 groups; Control(C; n=7), Endurance Training(ET; n=7), Muscular Training(MT; n=6). Results of this study are following, 1. Left ventricle mass was hypertrophied in more MT group and it was significantly different than ET and C group(p<0.05). 2. Diastolic right ventricle wall thickened in ET group and it was significantly different than C group(p<0.05). Systolic right ventricle wall thickened in MT group and it was significantly different than ET and C group(p<0.05). 3. Systolic right ventricle diameter was increased in ET group and it was significantly different than MT group(p<0.05). 4. Diastolic left ventricle posterior wall thickened in MT group and it was significantly different than ET and C group(p<0.05). 5. Diastolic left ventricle septum thickened in MT group and it was significantly different than C group(p<0.05).