In order to solve the problems of hard recycling，high cost，inefficiency of guar gum fracturing fluid，an efficient oil-displacement clean fracturing fluid system with near peptide chain structure viscoelastic surfactant as main component was prepared. The performances of temperature and shear resistance，salt tolerance，gel breaking and oil displacement of this fracturing fluid were studied. Finally，it was applied in Longdong oilfield. The results showed that the fracturing fluid had good temperature resistance（90℃）and salt tolerance（100 g/L）. The addition of organic acid regulator in fracturing fluid could reduce the effect of water salinity on the viscosity of fracturing fluid. The fracturing fluid had good sand carrying property and broke gel thoroughly with 2 mg/L residue content. The interfacial tension between broken fluid and kerosene could reach 10^-2—10^-3 mN/m. The fracturing fluid had been successfully applied to 25 wells in oilfield，and the output of single well was 6 times than that of adjacent wells. The fracturing fluid could be prepared again after simple treatment such as separation and sedimentation，and used for oil displacement after end-effluent treatment. The oil recovery rate increased by 10.67% on average on the basis of water flooding. The environmental pollution caused by fracturing fluid could be greatly reduced.