Objective To investigate the hemodynamic performance of bare-metal stents intervention treatment to cerebral aneurysm under steady flow. Discussing the porosity rates affect the hemodynamics in the aneurysm . Method Four simplified aneurysm models, representing no stent, the porosity rate of 82%,73%,64% stents deployed in the aneurismal sac were studied and compared in terms of flow velocity, wall shear stress (WSS) and pressure distributions by means of computational fluid dynamics. Results TheSbloodSvelocitySandSWSS correlatedSwellSwith theSporosity of theSstents. The pressure Swas very similarS before and after the stents deployed in the aneurysm. Conclusions The low porosity rate of stent can effectivelySisolate aneurysm model and reduce velocity in the aneurysm to preventSintracranialSaneurysm from rupturing .