Low tension foam has multiple function of system can profile modifying and plugging, emulsification and washing ability, and has huge potential in the field of tertiary oil recovery. Betaine surfactant, olefin sulfonates (AOS), sodium dodecyl sulfate (SDS) and polyoxyethylene dodecyl ether sulfate (AES) were studied from foam properties and interfacial properties, And good foam system with stable foam properties and low interfacial tension properties was selected. The result shows dodecyl hydroxypropyl sulfo betaine(SDS)has excellent foaming ability and stable foam stability, and it(250ppm) can still produce low interfacial tension(10 -2mN/m) with Zhuangxi crude oil. Foam property is better with oil saturation than common foaming agent, and foam stability is obviously enhanced. From single core flooding experiment, the results show that, foam plug of 0.3PV can enhance oil recovery up to a maximum of 29.7%, water cut decreased from 95% to 55%.