A hyperbranched polymer PADAH was synthesized by acrylamide(AM), acrylic acid(AA), cyclodextrin-modified hyperbranched functional monomer (MAH-β-CD-HPEA) and betaine (DEPS). The effects of initiator dosage, mass ratio of AM and AA, mass ratio of DEPS and MAH-β-CD-HPEA on the polymer solution viscosity were investigated. The results indicated that the optimum polymerization conditions were obtained as follows: initiator dosage of 0.3%, m(AM):m(AA)=2:1(85% of the total mass of the monomer),m(DEPS):m( MAH-β-CD-HPEA)=14.5:0.5(15% of the total mass of the monomer). The solutions properties of PADAH were evaluated. The results showed that the viscosity of 2000 mg/L polymer solution could reach 647 mPa•s, and the viscosity retention rate after shearing for 20 s was more than 80%, at 90°C, the viscosity of PADAH was 237 mPa•s and the viscosity retention rate was 37.5%, Compared with PADA(no hyperbranched functional monomer) and the partially hydrolyzed polyacrylamide (HPAM), PADAH has better solution properties.