IN ORDER TO COMPARE OF AORTA-CORONARY BYPASS AND CORONARY-CORONARY BYPASS BLOOD FLOW FIELDS IN THE END-TO-SIDE ANASTOMOSIS, IN THIS STUDY WE CARRIED OUT NUMERICAL SIMULATION OF THREE DIMENSIONAL PULSATILE BLOOD FLOW BY USING FLUENT 5.2.3 SOFTWARE. NONEXISTENCE OF SECONDARY FLOWS IN CORONARY-CORONARY BYPASS BLOOD FLOW FIELDS FOR VARIOUS DEGREES OF BYPASS GRAFTING ANGLES AGAINST AORTA-CORONARY BYPASS, RETURN OF TOTAL BLOOD FLOW TOWARD UPSTREAM IN CORONARY-CORONARY BYPASS 3 TIMES OVER A HEART CYCLE, HIGH TEMPORARY AND SPATIAL OSCILLATION IN WALL SHEAR STRESS MAGNITUDES FOR AORTA-CORONARY BYPASS AND LOW WALL SHEAR STRESS MAGNITUDES FOR CORONARY-CORONARY BYPASS WERE OF IMPORTANT RESULTS.