In order to obtain a polymer fracturing fluid with good performance on temperature and shearing resistance，a acrylamide copolymer PAAD which contained cationic groups and organic titanium cross-linking agent TC were designed and synthesized. The cationic polymer fracturing fluid was prepared by thickening agent PAAD，crosslinking agent TC and crosslinking accelerator polyol MH. The effects of the concentration of PAAD，TC，MH and pH value on the properties of fracturing fluid were investigated. The results showed that PAAD might be used as thickening agent and it had excellent viscosifying ability. TC could crosslink PAAD effectively to form polymer gel at acidic condition. MH reacted with PAAD under high temperature that could promote the formation of polymer crosslinking network and improve the viscosity and high temperature resistance of fracturing fluid. The properties of fracturing fluid were obviously affected by the composition of fracturing fluid. The viscosity of fracturing fluid increased with increasing concentration of PAAD. But the increase rate of viscosity decreased when the dosage of PAAD was above 0.6%. When the PAAD was in a certain concentration，TC and MH had an optimum concentration for the high viscosity gel. pH value had a considerable effect on the properties of fracturing fluid. The optimum pH value to prepare fracturing fluid was 3—4. The viscosity of fracturing fluid that contained 0.6% PAAD，1.0% TC and 0.2% MH remained 90 mPa·s after continuous shearing for 90 minutes at 150℃ and 170 s^-1，which could meet the requirement of fracturing construction in oil and gas wells at high temperature（150℃）.