Abstract: The electron mobility was measured to investigate the influence of test temperature, densification, oxygen concentration and doped alumina on performance of yttria-stabilized zirconia (YSZ) .The result shows that the lower oxygen concentration in testing electrode, the more influence of electron mobility on potential of YSZ cell and the amount of electron mobility is larger at lower work temperature to oxygen sensor.The high sintering density of YSZ and proper addition of alumina can decrease the amount of electron mobility and increase the accuracy of oxygen sensor.