A kind of synthetic polymer-based fracturing fluid system was introduced ，which was composed of0.40% thickener XJJ- 4，0.25% cross-linker J-1，0.015% pH regulator W-1 and 0.2% cleanup agent. The performance of heat resistant，shear resistant，viscoelasticity ，rheological property and gel-broken fluid was studied. The last viscosity of the fracturing fluid was about 120 mPa·s after shearing 2 hrs at 150℃and 170 s^-1. The fracturing fluid system was resilient to heat and shear. In the linear viscoelastic region ，the storage modulus G' was greater than loss modulusG' '，and it was a typical viscoelastic fluid. The consistency coefficient（2.141 mPa·s^0.476）was large ，and the index of rheological behavior（0.476）was small，indicating obviousnon-Newtonian fluid behavior. With adding 0.01% breaker APS，the gel was broken after 3 hrs at 150℃. The viscosity，residue content ，surface tension and interfacial tension of the gel-broken fluid was 1.38mPa·s，15mg/L，26.24mN/m and1.83mN/m respectively ，which would decrease the damage to formation and flow back easily.