| Flocculation is the most widely adopted in waster treatment. Flocculation effect concerns with the flocculation property directly. Based on the analysis and generalization of the existent organic cationic flocculants preparation and flocculation property researches, a new natural product, which belongs to a kind of green flocculants, was prepared by starch, a low-priced and an easily-got raw material. Its preparation was to modify the raw material. Meanwhile preparation experiment conditions and parameters were optimized through a lot of experimental studies.Synthesis of inartificial high molecule flocculent with starch , diallyl dimethyl ammonium chloride and arcylamide, using complex initiator and inverse emulsion polymerization with there-member polymerization. The paper discusses the effect of the monomer addition method, the concentration of initiator, the concentration of emulsifier ,the ration of oil and water ,the monomer's concentration, the ratio of monomer , the reaction temperature ,the reaction time on graft copolymerization reaction. Diving Zones in orthogonal test elected the optimum condition of experimentation. The resulted showed that 1.5‰, [E] = 6%, monomer / starch = 1.4:1 (the ratio of weight ),AM/DMDAAC =3:7 (the ratio of weight) , [M]=30%, the ratio of oil and water 1.6:1 , the reaction temperature 45℃ , the reaction time 4h , the grafting percentage is 128.55%, the grafting efficiency is 94.04% conversion 99.25% intrinsic viscosity 648.65ml/g the cationic degree 26.89%,and the molecular weight of graft copolymer is more than 6000 thousands. The product was measured by IR and ~1H-NMR spectra to identify the construction of graft copolymer. When we used the flocculant to deal with the waste water of oil field, the effect is better than other similar products. The large flocculate is found and the removal efficiency of COD, oil and turbidity of the waste water are 92.4% and 99.7 % .So, it is the better strong cationic flocculation.
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