The detail structural study of powder samples BaPbO3 has been carried out in the temperature range 300-1000K using neutron powder diffraction technique in order to characterize the temperature-induced phase transformations. The structures of different phases (from monoclinic to cubic) were refined by Rietveld method. Correct symmetry of distorted perovskite phases and atomic displacements associated with phase transitions were also studied as a function of temperature. The system of different tilts of PbO6 octahedra are considered and possible influence of octahedral distortions on physical properties of BaPbO3 are discussed.