Good surface integrity is frequently required of struc-tural ceramic components, since the lifetime of a ceramic component is, in most cases, determined by its surface features. In this study, two mechanical surface treatments, i.e. ultrasonic and abrasive blasting sur-face finishing, have been introduced to the surface of electrodischarge machined ceramic composites to improve their surface integrity. T he surface roughness, hardness, and topography of the ceramic composites were examined after electrodischarge machining (EDM) and surface treatment. T he eVect of surface integrity on the strength and its distribution was investigated. Results show that ultrasonic and abrasive blasting surface finishing can produce an improvement in both flexural strength and Weibull modulus, and are two eVective procedures to improve the surface integrity of the EDM ceramic composites.