Abstract: In view of the universality and complexity of unsaturated soil foundation vibration， the control of environmental vibration of ground vibration control of unsaturated soil foundation has become a research focus in soil dynamics. Based on the theory of sin? gle phase elastic media and porous mixture media， the vibration isolation effect of single phase elastic wave impeding block in an un? saturated soil foundation under harmonic load is studied. Considering the boundary conditions of surface drainage and exhaust， us? ing the Fourier transform and Helmholtz vector decomposition principle， the calculation formula for the dynamic response of the ground under dynamic loads is established. The effects of soil saturation， load frequency， embedded depth， thickness and elastic modulus of wave impeding block on the vibration isolation performance of unsaturated soil foundation is addressed. The results show that the wave impeding block in unsaturated ground can achieve a good vibration isolation effect. The surface displacement amplitude decreases significantly with the decrease of the saturation and the embedded depth of the wave impeding block， and de? creases significantly with the increase of the load frequency， the thickness and the elastic modulus of the wave impeding block.