Using pentaerythritol as branching agent, adding acrylamide according to certain proportion, and adding cationic monomer methyl acryloyl oxygen ethyl trimethyl ammonium chloride, cationic hyperbranched polyacrylamide was synthesized. The product was analyzed by the infrared spectrum, and rotational viscometer was used to test the polymer specific viscosity. At last, effect of the reaction temperature, reaction time and initiator dosage on the viscosity of product was investigated.%以季戊四醇为支化剂，按一定的比例加入丙烯酰胺（AM）并加入阳离子单体甲基丙烯酰氧乙基三甲基氯化铵（DMC）增加其阳离子性，合成了具有阳离子性的超支化聚丙烯酰胺。对产物进行了红外光谱（FTIR）分析，并使用旋转粘度计和一定计算测得了聚合物的增比黏度。而后探讨了反应温度、反应时间和引发剂用量对产物粘度的影响。
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