Abstract: According to the requirements of heat-resisting fracturing fluids, a compound crosslinking agent(JL-1) was synthesized by the copolymerization of ZrOCl₂, TiCl₄, acetylacetone, maleic acid, and isopropyl alcohol.The optimum reaction conditions were determined through studying the synthetic scheme and conditions of crosslinking agent by using the single factor experiment; and the structure of crosslinking agent was characterized by infrared spectroscopy and ¹HNMR analysis; the comprehensive application performance of crosslinking agent was evaluated.The optimum conditions were as follows:the molar ratio of ZrOCl₂:TiCl₄:MA:AAT:IPA was 1.20:0.800:0.220:0.180:0.440;the initial reaction temperature was 5 ℃ for 1.5 h and reflux reaction time was 3 h at the constant temperature of 60 ℃.The viscosity of the fracturing fluid with 0.80 wt%~1.0 wt% thickening agent XSS296 was about 0.80~1.49 Pa·s when the crosslinking mass ratio was 100:0.7.The final viscosity of fracturing fluid was above 50 mPa·s after continuously shearing 1.5 h at the speed of 170 s^-1 under 180℃.The fracturing fluid system has good shear resistant and heat resistant stability and sand-carrying performance.