Effects of four types of superplastieizer to the beating degrees, viscosities and ZETA petentials of two grades of brucite fibers were investigated. Dispersing effects of superplasticizer to brucite fibers were verified by means of SEM observation and concrete strength tests. The results indicate that different types of superplasticizer have different effects on the beating degrees, viscosities and ZETA potentials of brucite fibers. The surface of brucite fibers displays negative charge characteristics in superplasticizer suspensions and becomes more negative when the concentration of superplasticizer increases. Long grade brucite fibers have a higher beating degree and denser viscosity than the short ones. Under the condition of invariable fiber dosage, the flexural strength of concrete moves upward with the increase of water reducer dosage and fiber beating degrees, and then approaches to saturation. The diameter of brucite fiber changes from micromete, scales to nanometer dimension with the dispersing action of water reducers.