Abstract: Due to the fact that commonly used polymer fracturing fluids possess high residue content after gel breaking,also accompanied by by poor temperature resistance,a need for large volumes of thickener,and a high cost,a type of Gemini cationic viscoelastic surfactant with good performance has been developed.It was synthesized by taking into consideration molecular structure design,indoor synthesis,properties evaluation and optimization of the control conditions,which could convert it into a thickener.Finally,a new clean fracturing fluid HT-160 was developed by combining 5.0% of the thickener and a small amount of inorganic salts(potassium chloride and potassium bromide)by means of formula optimization.Indoor test results showed that the fracturing fluid system had obvious elastic characteristic and good suspension property,its viscosity could be kept at around 40 mPa·s after shearing for 2 hours under the conditions of 160℃ and 170 s-1.It could then be thoroughly broken without any residue after fully establishing contact with the kerosene.The study indicated that the fracturing fluid system could meet the requirement of deep reservoir fracturing operation,possessing a temperature resistance up to 160℃.