Abstract: Based on 3D finite element model built up for shrouded blade using ANSYS software, and combined with explicit analysis of dynamic impact response with LS-DYNA software, relationships between collision damping effect and vibration system parameters were studied, such as the original tip gap, the phase difference and the amplitude of exciting force, etc. Results show that the collision damping among blades with zigzag shroud may effectively suppress the system vibration. The finite element analysis results agree well with relevant experimental data, proving the finite element model and method to be feasible and effective.