The compaction behavior of a ceramic powder under high pressure over 1GPa was analyzed by means of Shima-Ohyane constitutive equation for powders based on a continuum model. Parameters of the constitutive equation were determined from high pressure uniaxial compaction tests with lateral constraint for ceramic powder compacts. The pressure distribution inside cylinder was estimated by measuring the electrical change on the basis of the phase transition of bismuth (2.55GPa). The result of simulation successfully agreed with experiments on the displacement and pressure distribution along the loading direction. Shima-Ohyane constitutive equation was concluded to be applicable to the compaction under high pressure over 1GPa
