The stress produced by vibration is a common and well investigated problem in the word of aviation. The stress caused by vibration can drastically reduce the life of a turbine engine and one of the main affected part of the engine are the blades. Design a last generation of gas turbine engine focusing on its reliability is a complicated task that can present a lot of problems. The blade has to be connected to the disk and before provide this assembly the dynamic behaviour must be predicted using different calculation methods available. The Finite Element Method (FEM) is one of the numerical methods that can solve the engineer calculation and and more precise than the analytical one.