We report a case of 15-year-old man with beneficial effects of short term growth hormone treatment presenting with cardiomyopathy combined with neuromuscular dystrophy. Transthoracic echocardiography revealed that LV chamber was markedly dilated and global LV systolic function was severely reduced. The findings of electromyography were compatible with neuromuscular dystrophy. Under the impression of cardiomyopathy combined with neuromuscular disease, maximal medical treatments such as inotropic agents, diuretics and ACE inhibitor were tried but we could not attain remarkable clinical improvement. Finally, we started growth hormone injection and after treatment for 3 months, we could attain remarkable clinical and hemodynamic improvement without any side effect.