To evaluate the cardiac functions we examed the M-mode echocardiography with measurements of blood pressure, heart rate and body surface area in 55 normal Korean adults(male 30 persons, female 25 persons) of mean age, 41.7±12.3 years. (1) Interventricular septal thickness is 9.5±1.7mm and left ventricular posterior wall thickness are 8.6±1.5mm at end-diatole, 14.0±2.1mm at end-systole. (2) Diastolic and systolic left ventricular internal dimensions are 49.1±4.8mm and 31.3±5.0mm, respectively. (3) Left ventricular mass by Penn Convention method is 174.4±52.1g and left ventricular mass index is 103.2±28.8g/m². (4) Relative wall thickness is 0.35±0.06. (5) Left ventricular volumes by Teichholz's method are 114.9±27.6ml at diastole and 40.2±17.2ml at systole. Therefore, stroke volume is 74.7±16.9ml and stroke volume index is 44.5±10.7 ml/m². (6) Cardiac output is 4944±1058 ml/min and cardiac index is 2951±666 ml/min/m². (7) Total peripheral resistance is 1454±356 dynes-sec-cm^-5 and total peripheral resistance index is 2472±623 dynes-sec-cm^-5·m². (8) Fractional shortening is 36.5±6.0% and pressure-volume ratio is 3.27±1.19 mmHg/ml. (9) End-systolic wall stress is 61.3±19.7x10³ dynes=cm². (10) Atrial emptying index is 0.66±0.18.