Abstract: DVA (Dynamic Vibration Absorber) is good for restrain of the resonance vibration in low frequency, espe- cially under the condition that there are only one mode or two modes in one frequency band. It seems rather difficult to control the resonance vibration of elastic structures in higher frequency, since usually there are so many modes in higher frequency band. The broad band DVA is brought forward to reduce the resonance vibration of elastic structures. The broad band DVA is designed on the basis of the characteristic of power flow in structure in this paper. The broad band DVA is effective on absorbing the resonance vibration power flow of the most important modes. The ability of absorbing vibration for the broad band DVA is analyzed in detail. The results obtained in this paper provide the basis for the optimization design of the broad band DVA and the optimization positions on structures.