For new energy dissipation buildings, this article points out that the effect of additional damping ratio should be taken into consideration in the design of the structure before installation of dampers by the application of mode-superposition response spectrum method. 2. 对于被动消能体系,指出采用振型分解反应谱法对尚未安装阻尼器的无控结构进行设计时,需要考虑阻尼器附加阻尼比的影响。