Abstract: The physical nature of the low-permeability fractured reservoir is complex and very special,and the water flooding exploitation is decided by the inhibition effect which depends on the surface active agent used in field.Analyzing the oil reservoir inhibition displacement mechanism and comparing experiment results,this paper analyzes the effect of different surface active agent with different concentration on inhibition displacement.Generally,the effect of core's inhibition displacement is declining with the increasing of concentration of the surface active agent,but surface active agent with a certain degree concentration can improve the core's surface wettability and is helpful to the inhibition displacement.This research provides theoretic basis for carrying out inhibition water flooding.