In this paper, the grinding force of precision grinding process of nanostructured ceramics (n WC/12Co) coatings with diamond grinding wheel is studied in detail. The grinding force of conventional ceramic (c WC/12Co) coatings is also studied experimentally compared to nanostructured ceramic coatings. The effect of grinding process parameters such as grinding depth of diamond grinding wheel, workpiece feedrate, bond type and grit size of diamond grinding wheel as well as the properties of ground materials on grinding force are analysied. Combined with SEM observations of the ground surface, the material removal mechanism in the grinding of nanostructured ceramic (n WC/12Co) coatings is analysied.