In view of the actual conditions of high temperature, high salinity in Orienteoil field, the viscosity- concentration relationship, viscosity-temperature relationship and stabilization of three kinds of polymer oil-displacing agents was investigated. It could be concluded that, with the increase of the concentration of the three kinds of polymer oil-displacing agents, the viscosity increased as well. Obviously, the tackification range of APP5 oil-displacing agent was greater than that of the other two kinds of polymer oil-displacing agents, and when the concentration of the APP5 was 2500 mg/L, the requirements of the theory viscosity value of the reservoir could be met. However, due to the specific conditions of the reservoir with high temperature (95℃), the single polymer APP5 could not continue to maintain theory viscosity value. Secondly, chromium acetate (the mass fraction is 2.7%) and 200 mg/L retarder (the main ingredient is hydroxy carboxylic acid salt—sodium tartrate) were added in the single polymer solution at polymer to “Cr³⁺” mass ratio of 60:1, the crosslinking reaction took place. The results showed that the viscosity of the three gels tended to stabilize after 60 days, and Cr³⁺/APP5 gel with polymer to “Cr³⁺” mass ratio of 60:1 could meet the requirements of the theory viscosity value of the reservoir. Finally, indoor physical simulation experiments indicated that when the average water content of oil field reaches 90%, Cr³⁺/APP5 gel was injected for 0.6 PV, the oilfield economic benefits achieve the best condition.