Abstract: The analytical model of finite plate stiffened by blocking mass under a point force is established. The structural response is derived by a combination of the modal method and the traveling wave method, and used for studying effect of blocking mass on energy transmission from the exciting plate to the receiving plate taking mean square velocity as evaluation index. The effect by the parameters of the blocking mass such as the mass ratio on energy transmission is discussed. It is shown that in low frequencies range, blocking mass can effectively impede vibration energy transmission when the rigidity of the blocking mass is considered and will enhance vibration energy transmission when its rigidity is neglected. And it is also found that in higher frequencies range the attenuation effect gets better with the increase of the mass ratio in the higher frequencies.