A lignosulfonate amphoteric flocculant（LDA） is synthesized by graft copolymerizatlon ot lignosulfonate with acrylamide （AM） and diallyl dimethyl ammonium chloride （DMDAAC）. The optimum reaction conditions are obtained as follows, reaction temperature is 50 °C, copolymerization time is 6 h, solid content is 20%, initiator mass fraction is 0. 1%, mass ratio of monomer to lignosulfonate is 4 ： 1, mass ratio of AM to DMDAAC is 2 ： 1. The intrinsic viscosity of LDA is 635.2 mL/g, the grafting efficiency is 99.2%, cationic degree is 26.8%. The structure is confirmed by IR, 1H NMR and SEM. Four kinds of waste water are treated by flocculation, and their CODs are up to the standards. And the results show that the flocculant can still hold the good flocculation efficiency under the operating conditions of high temperature and high salt.%以木质素磺酸盐、丙烯酰胺（AM）、二甲基二烯丙基氯化铵（DMDAAC）为原料，通过接枝共聚，制得木质素磺酸盐两性絮凝剂（LDA），得到了最佳合成工艺条件：反应温度50℃，共聚时间6h，固含量20％，引发剂质量分数0．1％，单体与木质素磺酸盐质量比4：1，AM与DMDAAC质量比2：1．产品LDA的特性黏度为635．2mL／g，接枝效率为99．2％，阳离子度为26．8％．利用红外、氢核磁共振和扫描电镜对其结构进行了表征．对4种污水进行絮凝处理，COD均达到排放标准，同时产品具有良好的耐温、耐盐性．
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