The temperature and the oxygen partial pressure dependencies of the electronic conductivity of [(ZrO2)(1-x)(CeO2)(x)](0.8)(YO1.5)(0.2) (x = 0-1, 0.1 step) solid solutions were measured by dc polarization using a Hebb-Wagner's ion-blocking cell. The main charge carrier was electron for ceria-containing compositions (x greater than or equal to 0.1) in a whole range of measured oxygen partial pressure [log(p(O2)/Pa) = -6 to 3]. With increasing CeO2 concentration, the electronic conductivity drastically increased for x = 0-0.5, slightly decreased for x = 0.5-1.0, and showed a maximum at x = 0.5. The electronic conductivity is proportional to p(O2)(-1/4) at the higher oxygen partial pressures and p(O2)(-1/m) (m > 4) at the lower oxygen partial pressures. It is suggested that Ce4+ ions in ZrO2-CeO2-YO1.5 solid solutions with low CeO2 concentration were reduced more easily. The compositional dependence of the electronic conductivity can be explained by the reduction of Ce4+ to Ce3+ and the stabilization of Ce3+ ion in the [(ZrO2)(1-x)(CeO2)(x)](0.8)(YO1.5)(0.2) structure.