The objective of this work was to investigate the ultrasound assisted sulfonation of the hyper-cross-linked resin H-06, which was of BET surface area 1019.08m2/g and micropore area 844.44m2/g. The amount of sulfonic acid groups uploaded onto resin was taken as evaluation index to investigate the effects of the ultrasound assisted sulfonation. Results showed that the optimum ultrasound sulfonation conditions were as follows: Dimethyl sulfoxide as swelling agent, reaction temperature 80℃, ultrasonic power 180W, 92.5% H2SO4, ratio of resin to sul...