The left ventricular performances (LVP), assessed by two dimensional echocardiography (2 DE) pre- and post-percutaneous balloon mitral valvuloplasty, showed a good linear correlation with those by angiography, the correlative coefficients being 0.94 (left ventricular volume), 0.93 (ejection fraction) and 0.90 (stroke volume), respectively. The results showed that 2 DE may be used in follow-up study of left ventricular performances instead of angiography. Accordingly, it was found that the short-term (6-10 months) effect in LVP of 57 cases post-PBMV assessed by 2 DE in comparison with that pre-PBMV was statistically very significant (t = 3.73-12.92, P less than 0.001); the long-term (12-42 months) effect of 88 cases post-PBMV evaluated by 2 DE compared with that pre-PBMV was statistically very significant (t = -3.73-10.46, P less than 0.001); all these showed that both the short-term and long-term cardiac functions post-PBMV had markedly improved. However, there was a significant difference in statistics (t = 2.41-3.14, P less than 0.05-0.001) between the short-term and long-term cavity area) and radionuclide angiography both during early diastole (r = 0.94) and atrial systole (r = 0.90). The above results were better than those obtained from pulsed Doppler (E area/Total, A area/Total) and radionuclide angiography: during early diastole (r = 0.78) and atrial systole (r = 0.76). Color Doppler can be used as a new method for assessing the pattern of left ventricular filling.