Abstract: This review article summarizes the applications of repetitive pulsed power in many fields, such as material development, environment protection, bio- and medical-science, light sources, and high-energy accelerators. The plasma immersion ion implantation and pulsed electron-beam surface treatment have been used in industrial production. Flue-gas and wastewater treatment by pulsed atmospheric discharge are being developed toward practical application. Sterilization and cancer-cell treatment using pulsed electric field have attracted great attention from academic and industrial communities. Plasma generated extreme ultraviolet(EUV) radiation is hopefully going to be used in photo-lithography for mass production in the near future. The thyratrons used on high-energy accelerators will eventually be replaced by power semiconductor devices.