Super acid is also called super acid. It is a stronger acid than 100% sulfuric acid. Especially liquid superacid HF. SbF5 super acid ratio 10 100% sulfuric acid strength 19 times, with serious corrosiveness and public hazards. Perfluorosulfonic acid resin (Nafion-H) is the strongest solid superacid known at present, which has the characteristics of good heat resistance, chemical stability and high mechanical strength. Generally, perfluorovinyl ether monomer with sulfonic acid group is polymerized with tetrafluoroethylene to obtain perfluorosulfonic acid resin. Due to the introduction of the most electronegative fluorine atom into Nafion-H molecule, it has a strong field effect and induced effect, which makes its acidity increase sharply. Compared with liquid superacid, when used as catalyst, it is easy to separate and can be reused. And is easy for industrial production.