In Shengtuo oilfield, the formation temperature was more than 80℃, the salinity of formation water was above 20000 mg/L, the concentration of calcium and magnesium ions was more than 500 mg/L, and the heterogeneity of reservoir was strong. According to the reservoir characteristics of Shengtuo oilfield, reinforced polymer flooding oil system was developed by adding polymer enhancer to ultra-high molecular weight hydrophobic associating polyacrylamide. The results showed that when the dosage of enhancer increased from 0 to 2500 mg/L, the apparent viscosity of oil displacement system increased from 7.8 to 42.9 mPa·s, the viscous modulus increased from 120 to 315 mPa, and the modulus of elasticity increased from 0 to 106 mPa. In the simulation of Shengtuo oilfield conditions, when the mass ratio of ultra-high molecular weight associative polymer and enhancer was equal to four, the viscosity retention rate of reinforced polymer flooding system was 85.5% after 60 days, which was better than that of modified polyacrylamide (GXPAM) (66.2%). The reinforced polymer displacement system had well thermal stability. When the reinforced polymer flooding oil system (2500 mg/L) was injected in heterogeneous core, the liquid production percentage of hypertonic model decreased from 98.5% gradually with 32.7% minimum value, and that of low permeable model increased from 1.5% step by step with 67.3% maximum value. When the sequent water (1 PV) was injected, the liquid production percentage of hypertonic model was 58.5%, and that of low permeable model was 41.5%. The core heterogeneity was improved obviously. When the core permeability ratio was 1:5 and 1:3, the enhanced recovery rate of reinforced polymer flooding oil system increased by 26.0% and 10.9%, however that of GXPAM increased by 14.8% and 7.1%, respectively. Oil recovery efficiency of reinforced polymer flooding oil system was better than that of GXPAM, and the flooding effect was better in high permeability ratio.