Comparing the mechanical characteristics of bio-ceramics with a elaborate bone, there are two important conditions required for biomaterial. First, the strength must be three times larger than that of a elaborate bone. Second, Young’s modulus must be two or three times larger than that. However, still the biomaterial hasn’t developed which satisfies these conditions. The purpose of this research is to improve the strength of bio-ceramics. It was discussed how the duration time and mean frequency of acoustic emission (AE) parameters depend on time. These parameters are calculated with AE wave on breaking test of a bio-ceramics. The following main results were obtained. First, AE generating pattern is changed by the property of the materials. Second, in tetragonal zirconia polycrystals (TZP), the phase transformation has affected AE parameters. Consequently, it was shown that AE parameters had the material dependability.

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