Functional status of patients after aortic and mitral valve replacement carried out in childhood and adolescence was studied in long terms after the operation. 30 patients after mitral valve replacement and 63 patients after aortic valve replacement were included in the observation retrospective study. All patients underwent complex clinical and instrumental investigation. Increased size of left atrium in combination with normal size of left ventricle and its ejection fraction were observed in most of the patients after mitral valve replacement. In most of the patients after aortic valve replacement indices of end-systolic volume were less than age-related norm. Physical capacity after mitral valve replacement amounted 1.5W/kg (75-100% from norm) in 13 patients, 1.0 W/kg (50% from norm) in 16 and 0.5 W/kg (25% from norm) - in 1 patient. Physical capacity after aortic valve replacement amounted 2.0 W/kg (healthy norm) in 12 patients (19%), 1.5 W/kg in 40 (63.5%) and 1.0 W/kg in 11 patients. Correlation between the level of physical capacity and indexed prosthetic orifice area was estimated as well: r=0,37 after mitral valve replacement and r=0,35 after aortic valve replacement. Hemodynamic disturbances after aortic valve replacement were observed in patients with prosthetic devices sized 19 and 21 and peak systolic gradient more than 40 mm Hg. It is drawn a conclusion that moderate physical capacity is observed in long-terms after the operation among patients with aortic and mitral valve replacement carried out in childhood and adolescence. At the same time physical capacity is weaker in patients with lesser indexed prosthetic orifice area.