Linear C-chain chemicals (n-caprylic acid, n-octanol, octane, oleic acid, oleyl alc. and liq. paraffin), extreme pressure additives (CCI4, tetrachloroethane, chlorinated paraffin and org. silicone) as well as surfactants (glycerol, polyethylene glycol 400 and Tween 80) were added to the grinding fluid used then for grinding Si3N4 plates. The addn. of alcs. resulted in an improvement of the plate surface quality. The addn. of acids and extreme pressure additives resulted in decreasing the surface quality. The addn. of surfactants alleviated the blocking on the surface of the grinding wheel and improved the surface quality of ceramics. The presence of deep scratches was closely related to the blockage of grinding wheels.