Abstract: A macromonomer 4-Allyl-heptylphenol (AHP) was synthesized. The hydrophobic association acrylamide copolymer (PAMA) was synthesized using acrylamide (AM), AHP and 2-acrylamido-2-methylpropanesulfonic acid (AMPS) by aqueous micelle frees radical copolymerization technique. The macromonomer and copolymer were characterized by 1H-NMR and FT-IR. The effect of AHP dosage, polymer concentration, NaCl concentration and temperature on the viscosity of copolymer solution was tested. The results indicate that the copolymer exhibits good thickening and salt tolerant property by addition of AHP. The apparent viscosity of 1500mg/L PAMA with AHP (mole fraction of 1%) in 20,000mg/L brine solution is up to 178.6mPa.s at 53℃，and the viscosity of 1500mg/L PAMA with AHP (mole fraction of 1%) in 7,000mg/L brine solution is 110.8.6mPa.s at 90℃. PAMA displays a good heat-resistant property.