In the present study, the hemodynamics inside an aneurysm was numerically investigated with FSI approach. For the aneurysms with various shapes, simplified computational domains were modeled with the geometric factors of parent artery and aneurysmal sac based on the clinical data of a femoral artery. Since both velocity and pressure of pulsatile blood flow have to be defined for the FSI simulation, the Dirichlet boundary condition with the velocity waveform was applied for the proximal parent artery and the pressure boundary condition based on the resistance and Windkessel models for the distal parent artery. Using these boundary conditions, the blood flow and arterial wall motion was predicted with the Carreau model for the non-Newtonian blood flow and the Mooney-Rivlin model for non-linear arterial wall motion. From the results, it was found that the blood flow inside an aneurysmal sac is determined by the complex interaction with the arterial wall motion, and the local region of an aneurysmal neck and sac is exposed to a relatively high mechanical force related to cause of rupture and dissection.