The preparation of composite bentonite that natural sodium bentonite as raw material and CTMAB/CPAM as modifier.The best preparation conditions: CTMAB dosage 5mmol, CPAM dosage 0.03g, original soil dosage 4g, stirring speed 300r / min, the modified time is longer than 2h. I t is showed that CTMAB and CPAM had entered the interlayer by SEM and XRD characterization of the composite modified bentonite. Decolorization rate above 95% when dealing with acid red, direct fast black and basic fuchsin three k inds of d yes by composite bentonite. Kinetic results show that quasi - two k inetic model can describe composite bentonite material of ye wastewater adsorption process.