Abstract: After more than 20 years water-flood development in Niuxintuo oilfield,many problems occurred,such as quick rises of water cut,serious water channeling and etc.,the weak gel flooding technology was carried out,and a certain effect of stabilizing oil and water control was achieved.However due to less experience on oil displacement effect evaluation,fine evaluation cannot be achieved.Therefore,the oil displacement effect evaluation technology was carried out,including flow direction monitoring technology,the effect of oil displacement agent components on gel,performance evaluation of gel system,oil displacement effect evaluation of oil displacement agent,etc.In the process of oil displacement field construction,these evaluation technologies can effectively guide the displacement formulas and the dynamic adjustment of construction parameters,and improve the flooding effect of Niuxintuo oilfield.