Objective  To simulate local hemodynamic distribution at particular arterial positions.   Methods  According to the model used

a geometric model of carotid artery bifurcation was constructed with Gambit software．Wall shear stress distribution at different flow rate in the carotid artery model was analyzed by numerical simulation．   Results  In common carotid artery areas

the wall shear stress distribution was almost even at different flow rate

but in internal carotid artery sinus areas

there existed special low wall shear scopes. The higher the flow rate was

the smaller the areas of low wall shear stress were.   Conclusion  Low wall shear stress is a high risk hemodynamic factor in the development of atherosclerosis.