During the injection process into the formation，polymers undergo severe physical and chemical degradation，resulting in significant viscosity loss. In order to reduce the viscosity loss during the polymer injection process，the concept of partially cured polymer oil displacement technology is proposed. At 70 ℃，polymer systems with different viscosities and curing degrees ranging from 60% to 100% were prepared by varying the stirring time of mechanical stirrer. The study investigated the seepage characteristics and oil displacement performance of polymers with different curing degrees in porous media based on macroscopic and microscopic models. The results showed that compared to fully cured polymers，partially cured polymer systems exhibited better viscoelastic properties，enabled better mobilization of residual oil and improved microscopic oil displacement efficiency. Partially cured polymer systems could establish higher resistance coefficients and residual resistance coefficients，and then could retain higher effective displacement viscosities after shearing through porous media. The degree of polymer curing was too low to facilitate the entry of polymers into the deep part of reservoir. In polymer system with curing degree of 60%，the blockage mainly occurred near the injection end of sand-filled tube at 0—1/5 distance，while in polymer systems with curing degrees of 80% and 100%，the blockage mainly occurred near the injection end of sand-filled tube at 1/5—2/5 distance. Compared to water flooding，the incremental oil recovery rates of macroscopic oil displacement for polymer systems with curing degrees of 60%，80% and 100% were 26.2 percentage points，29.0 percentage points，and 23.3 percentage points，respectively. Meanwhile，the incremental oil recovery rates of microscopic oil displacement were 37.3 percentage points，44.9 percentage points，and 36.0 percentage points，respectively. For heterogeneous reservoirs，the residual undissolved polymer particles in partially cured polymers exhibited good plugging and conformance control properties. As a result，the liquid absorption in low-permeability layers was increased，the affected volume was expanded，and thus the recovery rate of low-permeability layers was enhanced. The research results could provide theoretical guidance for field tests of partially cured polymer oil displacement.