<p>Fracturing fluid is the “blood“ of reservoir reconstruction technology. Single-well myriad square fluid and thousand square sand have become the main methods of volume fracturing in uncon-ventional oil and gas horizontal wells. With the gradual exploitation of oil and gas fields to the deep, higher performance requirements have been put forward for fracturing fluid. In this paper, nano- TiO₂ was modified by vinyltrimethoxysilane, and a new type of nanocomposite polymer (PTAS) was synthesized by aqueous solution polymerization of modified nano-TiO₂ with acrylamide (AM), acrylic acid (AA) and 2-acrylamide-2-methylpropylsulfonic acid (AMPS). The synthesis conditions such as monomer ratio, polymerization temperature, polymerization time, and initiator dosage were optimized by using the viscosity of the base solution as an index. The structure and properties of PTAS were characterized by Fourier transform infrared spectroscopy, scanning electron microscopy, transmission electron microscopy, and thermogravimetric analysis. The experimental results showed that the nano-TiO₂ was successfully modified by vinyltrimethoxysilane, and the modified nano- TiO₂ was successfully attached to the polymer molecular chain. The performance evaluation results of PTAS showed that compared with the polymer without nano-TiO₂ P(AM-AA-AMPS), the salt resistance, sand carrying, temperature resistance, shear resistance, and gel breaking properties of PTAS were improved, This is due to the additional modified nano-TiO₂, which enhances the polymer network structure and improves its structural stability, so that the polymer can maintain good thickening behavior performance while reducing the molecular weight, reducing the residue content after gel breaking, and reducing its damage to the formation. PTAS has a good potential for application in hydraulic fracturing.</p>