Green bodies of 25%CePO4/ZrO2 and ZrO2 ceramics were joined at 1450℃ for 120 min without applied pressure by using mixed powders slurries composed of CePO4 and ZrO2. The effects of CePO4/(CePO4+ZrO2) ratio of the adhesive on the bond strength of the joints were investigated. Maximum bond strength of 414MPa was obtained by joining an adhesive with the ratio of 0.5. Under the experimental conditions, the grain size of the particles grown in the joint was smaller than that in joined ceramics. The microstructure of the joint was more homogeneous than that of the matrix and without obvious cracks, pores and other defects.