Elastic metamaterials can be used for vibration and noise reduction， waveguide， stealth and other special elastic wave control functions， which have broad engineering application prospects. In this paper， solid-liquid phase change materials are intro?duced as the scatterer to compare the band gap characteristics and vibration isolation performance of the scatterer under the two forms of solid and liquid. The numerical method is used to calculate the band structure and the dynamic effective mass of unit cells，the factors affecting the band gap characteristics of metamaterials are studied， and the vibration isolation performance of two forms of metamaterials is verified by experiments. The results show that the liquid scatterer metamaterial can generate local resonant band gap to achieve low frequency vibration isolation， and the solid scatterer metamaterial can generate Bragg band gap to achieve wide frequency vibration isolation. At the same time， the band gap of the two design forms can be well regulated by changing the external conditions. Therefore， the transformation of the two design states of the metamaterial scatterers realizes the transformation of the band gap type and the adjustment of the vibration isolation band， which can provide a reference for the configuration design and the regulation of the vibration isolation characteristics of the phase change scatterers metamaterial adapted to the thermal environment.