Abstract: As a plugging agent,polymer gel is one of the most commonly used in the process of conformance control in water-flooding reservoirs,and the key to the application of gel in reservoirs in the harsh conditions of high temperature and high salinity is its temperature and salinity-resistance performance.Therefore,this paper evaluates the forming performance of gels prepared by cross-linking acrylamide (AM)/2-acrylamide-2-methylpropanesulfonic acid (AMPS) coplymers and AM/AMPS/N-vinylpyrrolidone (NVP) terpolymer with hydroquinone and hexamethylenetetramine in simulated brine with a salinity of 25×10⁴mg/L at 110℃ and 155℃,respectively.It is clear that AM/AMPS copolymer with 30% AMPS content as the main agent is more likely to form a stable gel.The analysis of solid-state nuclear magnetic resonance carbon (C-NMR) spectroscopy of gels with different degrees of dehydration reveals that the temperature and salinity-resistant gels are mainly characterized by the retention of a certain amount of amido methylpropanesulfonic acid after long-term heat treatment.On this basis,the results of cryo-SEM and FTIR analysis indicate that the selection of polymers with high AMPS content and the regulation of the amount of cross-linking agent can optimize the salinity-sensitive groups such as primary amide and amido methylpropanesulfonic acid in the gel,thus effectively inhibiting the intramolecular catalytic hydrolysis of amido methylpropanesulfonic acid and regulating the temperature and salinity resistance of the gel.