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In order to simulate the left coronary blood flow dynamically and to make the mechanisms of its characteristics clear, an electronic circuit model of the coronary vessel using Field Effect Transistor (FET) is proposed. As a result of the dynamic simulation using this circuit, the blood flow in the septal artery shows dominance in diastole compared to that in systole. And the flow in the veins of epimyocardium shows an inverse trend in the early systole. These waveforms are similar to those observed in real left coronary circulation. From these results, it can be predicted that the resistance of the coronary vessel has an integrational effect on the arterial pressure and its capacitance has a differential effect on the intramyocardial pressure and each of these two effects can play a very important role in determining the left coronary circulation.