Abstract: Fractures are widespread in carbonate reservoirs of the Tahe Oil Field.The reservoirs are het-erogeneous,and are difficult to keep water shutoff and profile controlled.A selective filtration porousmedia plugging agent was chose to modify fractures into oil/water selective porous media.In this way,the velocities of injected water,bottom water and oil displacement agent were controlled.Solidified par-titles coating and selective water blocking technologies were taken as the research focus.In lab resear-ches,formula of the agent was improved.Simulations in visualized fractures indicated that sand barriersformed by the agent could resist scour.The agent can be used in big fractures to shutoff water and con-trol profile.