Grinding is a most important machining method for Si3N4 ceramics. Utilizing interracial chemistry reac tion membrane between grinding fluid and Si3N4 ceramics can reduce friction factor, soften surface layer and meanwhile improve the grinding efficiency, which is a bran-new research direction. This article, based on high efficiency grinding of Si3N4 ceramics by the way of half plasticity removal, descanted on the assistant function of interface chemistry reaction to improve the removal rate of Si3N4 ceramics in the application of organic grinding fluids represented by alcohols grinding fluid. To target action mechanism research, it applies the methods of classification,comparison and induction, and advanced test equipments to explore the effects of long, short carbochain alcohol and their water solutions acting as grinding fluids. In addition, it also discusses the effective function of three groups of organic matters such as perhalogeno hydrocarbon, cationic surfactant and tetra ethoxysilane acting as grinding fluid components from different angles, reveals their mechanisms of action, and supplies theoretical basis for the development of machining ceramic grinding fluid of high efficiency, low cost.