The energy dissipation efficiency of the traditional energy dissipation damping system is limited when the displacementbetween layers is small. This paper introduces a kind of enhanced damping system with a viscous damper with displacement amplifier，which can enhance the energy dissipation capacity of the system by amplifying the deformation of the damper. Based on the de?formation and stress characteristicsof the system，the energy dissipation and high order effect mechanical models are established，and there is an asymmetry in the process of stretching and compression deformation of the dampers，then the influence of model parameters on mechanical properties is further discussed. The experimental model is designed and manufactured，and the reciprocating loading test under sinusoidal load is completed. The correctness of the theoretical mechanical model is verified by comparing theexperimental results with the theoretical curve，and the frequency correlation and fatigue performance of the displacement amplifying damper are discussed by experiments. Finally，the seismic response of a frame-shear wall damping structure is analyzed，andthe enhanced damping system with a small number of viscous dampers with displacement amplifier can achieve several times thedamping effect of regular dampers.