Green bodies of 25%CePO 4 /ZrO 2 and ZrO 2 ceramics were joined without applied pressure by using mixed powders slurries composed of CePO 4 and ZrO 2 . The effects of CePO 4 /(CePO 4 +ZrO 2 ) ratio of the interlayer on the bond strength and microstructure of the joints were investigated. Maximum bond strength of 414MPa was obtained by joining with 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 those in joined ceramics. The microstructure of the joint was more homogeneous than that of the matrix.