In this article, the measuring principle of AC impedance applying for the oxygen sensor solid electrolyte was introduced, and by means of equipment of AC impedance, the samples ,which ware compounded by (Y_2O_3)_(0.08)(ZrO_2)_(0.92),sintered by Spark plasma sintering (SPS) at 1350℃10min and fried electrode at 950℃2h ,were tested. At the same time, using the ZVIEW soft the AC impedance tested result of the(Y_2O_3)_(0.08)(ZrO_2)_(0.92) samples sintered by Spark plasma sintering (SPS) and conventional sinter...