Abstract: Ceramics have numerous excellent properties such as low density, high hardness and wear resistance, but their practical applications in the structural materials field are still extremely cautious. The fundamental reasons are the flaw sensitivity of ceramics and the imperfect theory of ceramic failure prediction. The common flaws in the process of ceramic preparation are introduced, and the physical nature of the random distribution of ceramic strength is analyzed, and then the research status of strength prediction in ceramics under the action of flaws is summarized. It is pointed out that non-destructive testing, in-situ testing and computer simulation technology could be comprehensively used in the future to explore the mechanism of flaw inducing cracking and the quantitative law of ceramic-strength response, and meanwhile attention should be paid to the influence of flaws on ceramic-strength in the actual service environment(fatigue, thermal shock, etc.).