Background/Aim: Post-operative left ventricular (LV) systolic and diastolic functions are not separately described according to valve in valvular heart disease. The purpose is to assess LV systolic and diastolic function before and after cardiac valve operation. Methods: Sixty-three patients (mean age 52 짹 12 years) underwent mitral valve (MV) operation and 31 patients (mean age 64 짹 11 years) underwent aortic valve (AV) operation were participated. LV end-diastolic volume, LV end-systolic volume, ejection fraction, left atrial (LA) volume index, E-velocity of mitral inflow, A-velocity, deceleration time, and mitral annular early (Ea) and late diastolic (Aa) tissue velocity were measured before and after valve operation within 3 days. Results: LV ejection fraction significantly decreased after MV operation (68 짹 16 % vs. 60 짹 18 %, p < 0.01) but did not significantly change after AV operation (61 짹 15 % vs. 57 짹 14 %, p = 0.14). LA volume index significantly decreased after operation in MV and AV groups (81.2 짹 41.4 ml/m2 to 47.8 짹 27.4 ml/m2 in MV operation, 50.1 짹 13.5 ml/m2 to 36.6 짹 5.6 ml/m2 in AV operation, both p < 0.05). However E-velocity, A-velocity, and mitral annular early and late diastolic tissue velocity were not significantly changed. E/Ea ratio showed no significant change after operation in both groups. Pulmonary arterial systolic pressure significantly decreased after operation in both groups. Conclusion: LV diastolic function does not change immediately after mitral or aortic valve operation although LV systolic function may decrease after MV operation.