In this paper，a high-viscosity polyacrylamide molecular structure with slow-released cationic groups and delayed supramolecular thickening action was designed，the synthetic parameters were optimized，and the solution performance of temperature and salt resistance，delayed viscosification，potential and particle size，were evaluated，and the oil displacement effect of the new delayed polymer was also investigated. The results showed that the viscosity of the delayed polymer could reach up to 15.4 mPa·s at the temperature of 90℃ and at the salinity of 32864 mg/L，showing good temperature resistance and salt resistance. With the increase of aging time，the viscosity of BM solution decreased continuously，but the viscosity of the delayed polymer solution increased instead of decreasing. Moreover，the viscosity of the delayed polymer solution after aging for 90 d was 2—4 times that of conventional polymer BM solution，and the viscosity retention rate reached up to 107.7% ，showing good viscosification performance and high viscosity stability. With the prolongation of aging time，Zeta potential of the delayed viscosifier solution gradually shifted from negative to positive，and the particle size increased，which verified the delayed viscosification mechanism. The oil recovery on the basis of water flooding（recovery factor 41.2%）could be enhanced by 27.7% by injecting 0.3 PV 2000 mg/L delayed viscosifier solution. The field test also achieved a good effect of increasing oil. This technique provides a new method for reducing polymer dosage，and also provides a strong technical support for enhancing oil recovery in high temperature high brine flooding reservoir of Shengli oilfield.