A new sample of triple oxidesbarium-thulium bismuthate Ba2TmBiO6 with perovskite structurehas been synthesized by ceramic technology. The unit cell parameters of the sample and the coefficients of thermal expansion have been determined by the method of X-ray analysis. Thermal properties of the sample have been studied by DTA over the temperature range of 293-1473K. The heat capacity of the compound has been measured over the range of 5-320K by vacuum adiabatic calorimetry. Thermodynamic functions of the compound have been determined based on the heat capacity data.