In order to solve the problem that conventional polymers cannot meet the technical requirements of acid fracturing in ultra-high temperature and deep wells, two polymers SY-1 and SY-2 were prepared by free radical polymerization using acrylamide(AM) 2-trimethylammonium ethyl methacrylate chloride (DMC)and AM DMC SMA ( octadecyl methacrylate ) as raw materials, and their structures were characterized and their properties were tested. The results showed that 720 cm-1in SY-2 infrared spectrum was the bending vibration absorption peak of—(CH2)n—, and the monomer was successfully grafted onto the polyacrylamide molecular chain. Thermogravimetric analysis showed that the weight loss ratio of SY-1 to 600?Cwas 98%, and that of SY-2 was 86%, and the thermal stability was improved. In 20% hydrochloric acid, the mass fraction of SY-2 is 0.8%: 180?C, 170s-1 rheological properties test, SY-2 shear end viscosity 56mPa?s, 90?C, 120?C, 150?C shear 1h, viscosity 83.6mPa?s, 43.5mPa?s, 27.8mPa?s, shear stability were 85.66%, 74.45%, 52.01%. At 180?C and 3 MPa, the static acid-rock reaction rate is 8.94 ? 10-5 (g/cm2 ? s), which is one order of magnitude lower than the conventional SY-1 reaction rate of 1.69 ? 10-4 (g/cm2 ? s). It has good compatibility with corrosion inhibitor and iron ion stabilizer to overcome the application bottleneck of high temperature acid fracturing technology.