The electrokinetics property of mineral additive(fly ash, slag, silica fume) used in high performance concrete was investigated. The effect of FDN water reducer on the electrokinetics of mineral additive was tested and the rheology behavior of composite cementitious material with different mineral additive was studied. The results indicated that the electrokinetics of mineral additive depends on their chemical composition, fineness and density. The influence of FDN water reducer on the electrokinetics of mineral additive is different. The rheology behavior of composite material is closely related to variety, fineness, incorporation of mineral additive, the kind and incorporation of water reducer.