Abstract: The research method and evaluation system of the weather resistance of super-absorbent resin based on acrylic acid were established，and the decomposition kinetics of such a super-absorbent resin were studied with ultra-violet irradiation.The results showed that the aging mechanism of such a super-absorbent resin was the hydrolysis of crosslinker N，N′-methylenebisacrylamide hydrolyzed under ultra-violet light，leading to disassembly of the crosslinked structure.The decomposition rate was controlled by light reaction when the intensity of ultra-violet light was low but was controlled by hot reaction when the intensity of ultra-violet light was high.When the dosage of acrylamide increased to 70%,the dosage of N，N′-methylenebisacrylamide increased to 0.139%，and the neutralization degree of acrylic acid increased to 100%，the loss of mass decreased from 100%，100% and 42.0% to 0、9.3% and 30.4%,respectively.