The high-temperature strength of Ce-TZP was measured at 200, 650 and 100$0^{circ}C$ by 4-point bending test. And its fracture behavior was observed by SEM. Below $650^{circ}C$ of the temperature, where monoclinic fraction was almost zero, the decreasing rate of bending strength was relatively slow, but above this temperature, high temperature strength was largely decreased as a result of the decrease of stress-induced transformation of zirconia. The observation of fracture surface bended at 100$0^{circ}C$ indicated that the fracture mode changed from intergranular-into transgranular-form with regardless of ceria contents.