The utilization of ceramics materials for structural components has been widespread because of their excellent properties. But the ceramic components require high precision and integrity of surface. The grinding is the main productive technique for finishing the ceramic components in the manufacturing industry, but it is prone to surface and sub-surface damage. Consequently the induced damage will reduce the life of the component, even leads to failure. So, to improve grinding quality and reduce grinding damage, it is important to understand the damage mechanisms and process for ceramic materials. In this paper, attempts are made to build a damage model and to compute damage variable D. The damage variable will be used in the further computation. The research effort made may be the foundation of the ceramic components design and the optimization and control of ceramic grinding process.