Abstract: Aiming at the problems occurred in middle-late development period of low permeability reservoir in Dingbian oilfield,such as low oil displacement efficiency and poor development effect of water flooding,the research on surfactant oil displacement technology was carried out.Through indoor experiments,the HB-DB-1 surfactant system was selected out,which could enhance oil recovery rate of 11.1% under the conditions of 0.2% concentration and 0.3PV injection volume,and it could also reduce the displacement pressure.In the end the testing well group HK17 A was optimized and the preparation of field test program was expected to improve the recovery rate by 2% ~ 3%.