Recent progress on the development of photoacid generators (PAGs) and photobase generators (PBGs) was reviewed.We have developed non-ionic PAGs based on oxime sulfonate and N-hydroxyphthalimide sulfonate structures.They were thermally stable and highly sensitive to UV light.And also several types of PBGs have been developed based on O-acyloximes and ammonium salts.On UV irradiation the PBGs can generate primary, secondary, or tertiary amines.Furthermore, some applications of PAGs and PBGs for UV curing and photocrosslinking systems are reviewed.