Abstract: Strong alkali ASP flooding can substantially improve the recovery and achieve good oil displacement efficiency.Through physical simulation experiments,the research on flooding effect and the flooding characteristics has been carried out.Experimental results show that strong Alkali ASP flooding has strong wash oil and emulsifying capacity,which can enhance oil recovery more than 20%.In flooding process,two strong enrichment oil zones(profile control oil wall zone and emulsified oil wall zone) have been formed.In profile control oil wall zone,the water content decreases rapidly,the minimum water content values are lower but the water content rises rapidly.Water flooding pressure reaches maximum pressure,increasing 3~6 times.In the follow-up water flooding,output side water flooding begins to produce the emulsion and the emulsion is serious.