In order to study the change law of various performances of the functional poly-surfactant during the long distance migration process in porous media，a physical sand-packed model with 30 meters long was set up to conduct the oil displacement experiment with poly-surfactant BI system in laboratory，the dynamic law of the mobility control ability and the pressure， viscosity，concentration and emulsification of the poly-surfactant during the long distance migration was studied. The experimental results showed that the injection of poly-surfactant BI system could greatly improve mobility ratio and percolating resistance. The oil recovery percentage could be increased by 20.85% on the basis of waterflooding（43.12%），and the total recovery degree was as high as 63.97%. The effective distance of poly-surfactant solution was 2/3 of the injector-producer spacing. The viscosity and concentration of the poly-surfactant BI system reduced to a quite lower level after migrating 20 m，and so as the pressure reflected. The poly-surfactant BI had a strong emulsifying ability，which made emulsion band form in the model. The emulsion band migrated to the in-depth area of the model with the injection of poly-surfactant system，the emulsion was broken when migrating 20 m，and the emulsion could not be formed in the latter 1/3 of the injector-producer spacing.