Foam flooding is an important technology to improve oil recovery. In this work, a kind of giant surfactant HPOSS-PS₂₅ was synthesized by one pot method with multiple clicks reaction. By introducing its high surface activity and viscosification property, the foaming property, foam stability and viscoelasticity of the foaming solution were improved remarkably. Meanwhile, through foam stabilization experiment and foam flow experiment, the influence of HPOSS-PS₂₅ on foaming ability, foam stability and profile control and displacement was measured and analyzed in detail. From the experiments results, compared with HPAM/SDS, the foaming time of 200 ml as for HPOSS-PS₂₅/SDS was reduced by 40.1% to be 42.3 s, and defoaming half-life was increased by 128.0% up to 871.4 s. Furthermore, the resistance factor at 50℃ was enhanced by 28.8% up to 985.