Abstract: In view of reservoir conditions in Jingan oil field, a low interfacial tension's foaming system with interfacial tension of 10^-1mN/m was screened out by analyzing the foaming ability and stability of several foaming agents. The result of the performance evaluation shows that the system has good foam performance, good heat resistance and salt tolerance. The resisting force factor of the foaming system is evaluated through singlet-tube flooding experiment, then the optimal gas fluid ratio is determined to be 2:1.The double-tube flooding experiment result shows that foaming system can be distributed uniformly between high and low transmissibility tube, and the comprehensive recovery is enhanced 10.94% by injecting the foam system after water flooding.