The thermodynamic properties of different geometric structures of 1,2-cyclohexanediol which were rarely reported in literature, such as combustion enthalpy, formation enthalpy, melting enthalpy and heat capacities, were determined by NETZSCH DSC 204 Scanning Calorimeter. The relationship between the melting point and the composition for the mixture system of cis-1,2-cyclohexanediol and trans-1,2-cyclohexanediol was investigated and corresponding phase diagram was obtained. The melting enthalpies of both cis-1,2-cyclohexanediol and trans-1,2-cyclohexanediol are 20.265 kJ.mol(-1) and 16.368kJ.mol(-1) respectively. The standard combustion enthalpies of cis- and trans-1,2-cyclohexaneddiol were determined by calorimeter. They are respectively -3507.043kJ.mol(-1) and -3497.8kJ.mol(-1) at 298.15K. The standard formation enthalpies are respectively 568.997kJ.mol(-1) and 578.240kJ.mol(-1) for cis- and trans -1,2-cyclohexaneddiol.