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Objective To research the effect of the distance between stenosis and anastomosis on the hemodynamics of the coronary anastomosis，which may provide some theoretical guidance for the clinic treatment. Methods Three models with different distances between stenosis and anastomosis are made and analyzed by finite element analysis，and the distances are 0.0045m，0.006m and 0.009m respectively. Results The hemodynamic parameter in coronary artery changes as long as the distance between stenosis and anastomosis changes. At time of 0.09s，the maximum velocities of the cross section near the anastomosis are 0.54m/s，0.45m/s and 0.37m/s corresponding to model L1.5，L2 and L3. At the same time，the distances between stagnation and anastomosis on the lower wall are 0.0024m，0.0039m and 0.0068m corresponding to model L1.5，L2 and L3. Conclusions Keeping a big distance between the stagnation and anastomosis is helpful for the hemodynamic environment of anastomosis.