In order to enhance oil recovery of heavy oil reservoirs，in this paper，the profile control performance of binary （surfactant-nanoparticle） and ternary （surfactant-nanoparticle-polymer） synergistically stabilized emulsions at different oil-water ratios on high and low permeability cores was systematically investigated by using heterogeneous dual-core parallel experiments combined with CT scanning. The results showed that the O/W emulsion stabilized by the ternary system achieved the optimal profile control effect when the oil-water ratio was 1 ∶ 9 . After injecting 0 . 13 PV of emulsion，the diversion rate of the high-permeability core stabilized at approximately 55 %，and the diversion rates of the high- and low-permeability cores could quickly reach and maintain equilibrium，realizing effective and durable mobility control. With continuous emulsion injection，the displacement pressure difference of all systems gradually increased and reached a peak at the injection volume of 0 . 5 PV . The peak pressure difference increased significantly with the rise of oil-water ratio，the peak pressure difference corresponding to oil-water ratios of 1 ∶ 9，3 ∶ 7，and 5 ∶ 5 was 1 . 6，4 . 2，and 8 . 2 MPa，respectively. When the emulsion with oil-water ratio of 5 ∶ 5 was injected，no demulsification occurred，and a large number of oil droplets were retained in the pores. When injecting emulsions with oil-water ratios of 1 ∶ 9 and 3 ∶ 7，the volume fraction of oil phase in the produced fluid was higher，which reflected the plugging effect of polymers：polymers could significantly increase displacement pressure while endowing the system with strong fluidity，promoting crude oil to be produced in the form of O/W emulsion. In addition，the addition of polymer reduced emulsion droplet size and decreased the proportion of large droplets that played a major role in plugging. Therefore，at the oil-water ratio of 1 ∶ 9，the plugging performance of the ternary system emulsion was slightly lower than that of the binary system. The matching between emulsion droplet size and pore throat scale was the key factor affecting plugging efficiency. The ternary system emulsion had concentrated particle size distribution and stronger matching with the pore throat of main flow channels，making it easier to form a stable plugging structure in pore throats. This study provides theoretical basis and technical support for efficiency improvement of cold production and optimization of later development of heavy oil reservoirs.