Abstract: A new type of CAM response amplifier with metal damper is proposed, and its working mechanism and restoring force calculation formula is introduced. Furthermore, the motion equation and energy equation are established for the single-degree-of-freedom system of CAM response amplifier with metallic damper. Based on the same control effect, the seismic responses of the single-degree-of-freedom systems with larger damping metal dampers and with the cam-type response amplification device of smaller damping metal dampers were analyzed and compared respectively. By using metallic damper and CARD with different design parameters, the control effect was compared and analyzed based on the same displacement under all levels of earthquakes. The results show that all the combined cam-type response amplifying metal dampers can achieve the same displacement control effect and energy dissipation ratio as the traditional metal dampers, and the shear stress control effect is also significantly improved under all levels of earthquakes. The results show that the smaller damping metal damper can achieve the same displacement control effect of the larger damping damper directly by response amplification, which is more economic. In addition, the device can avoid displacement failure of the damper under extremely rare earthquakes, so that the safety of the structure and damper is ensured under earthquakes at all levels.