A kind of polyacrylamide polymer RDTA was prepared by free radical aqueous solution polymerization with acrylamide (AM), hydrophobic monomer allyl group dodecylamine and salt tolerant monomer H-66 as raw materials. The polymer structure was characterized by 1H NMR and FTIR, and the association effect of RDTA in different solutions and the relationship between the association behavior and temperature changes were studied through apparent viscosity, SEM, and rheological properties tests. The experimental results indicate that the critical association mass fraction (W*) of RDTA is between 0.25% and 0.3%. The stimulation effect of salt ions on RDTA polymer chains can enhance the structural viscosity of the molecular chain. The elastic modulus G" increases with the increase of RDTA mass fraction, and the solution system exhibits elasticity, resulting in a more dense spatial structure. At 70℃, 90℃, and 120℃, under 170 s-1 shear, when the shear time of 0.5% RDTA in 6% NaCl salt solution is less than 300 s, the viscosity of the solution shows a slow upward trend, indicating that RDTA has a phenomenon of salt stimulating RDTA solution thickening in NaCl salt solution. After further shear for 1 hour, the remaining viscosity after shear is still above 60 mPa·s.