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Charge density distributions of cubic SrTiO3 have been investigated related to the atomic replacement e ect on the phase transition, by analyzing the synchrotron-radiation X-ray powder-di raction data by the MEM(Maximum Entropy Method)/Rietveld method. The chemical bonding natures between constituent atoms in cubic SrTiO3 are compared with those in cubic BaTiO3 that we investigated previously at the same temperature. The Characteristic charge density distribution around the O atom, which may present a clue what kind of phase transition occurs in the cubic perovskite oxide, is found in SrTiO3.