In order to increase power generation efficiency, turbines are operating with increasingly longer blades at higher pressure and temperature. Therefore, fault diagnosis and failure prediction of turbine blades are becoming more important. In this study, structural and damage analysis of rotating blades are conducted using the finite element method and extended finite element method. For healthy blades, we find stress concentration areas of the blades. Furthermore, considering initial cracks that exist in the weak areas of the blades, we investigate the effects of the cracks on the dynamic behaviors and discuss the tendency of crack propagation.