Our company has designed and developed 3000 kV inflatable impulse voltage generator, which can be used for lightning wave and operation wave test of 1000 kV grade GIS or GIL. This design solves the problem of installing and testing UHV GIS and GIL in the field. In the future, through the combination of UHV GIS and GIL with pneumatic test transformer, it can form a multi-functional test platform. This new design can be used not only for lightning wave and operation wave test, but also for AC test. If necessary, it can also be combined with DC test.