Abstract: The variation characters of Raman spectra of C—O bandliberation peak ν1097 of dolomite at the experiment pressure of 100~1000 MPa and temperature of 298 K were studied using hydrothermal diamond anvil cell (HDAC). The results show that dolomite is stable under the experimental pressure with good correlation between the Raman peak position shift and the pressure. The relationship between the system pressure and Raman peak position shift of calcite (1097 cm-1) is given as follow: p=143.47(Δνp)1097+102.67 (1097<νp<1103). Therefore, dolomite can be used as a pressure gauge for the hydrothermal diamond anvil cell.