In order to obtain fracturing fluid with excellent performance，a new type of quaternary polymer thickener was prepared by aqueous solution polymerization using α-methacrylic acid（MAA），2-acrylamide-2-methylpro panesulfonic acid（AMPS），N， N-dimethyl acrylamide（DMAM），N-vinylcaprolactam（NVCL）as raw materials. The rheological properties of solutions at different mass concentrations were also studied. The polymer fracturing liquid gel system was prepared by using the organic zirconium cross-linked quaternary polymer. The effects of cross-linking ratio，shear rate and temperature on the cross-linking process were investigated. The result showed that the polymer had a strong viscosity-increasing ability with obvious shear thinning， the viscosity of 0.6% polymer solution was 100 mPa·s at the temperature of 25℃ and at the sheer rate of 170 s-1 . The flow curve could be well fitted with the Cross model. The crosslinked gel synthesized by 0.6% thickener solution and crosslinker at a crosslinking ratio of 100∶0.6 had stronger viscoelastic properties. Moreover，the polymer cross-linking process could be well simulated by the four-parameter cross-linking rheokinetics equation，which provided a rheological research basis for the application of polymer fracturing fluid.