Graphene has potential applications in Li ion batteries and flexible electrical devices due to its electrically conductive and transparent properties.In our group, different kinds of graphene based materials had been prepared, which includes 3D graphene hydrogel, 3D grapheme / Fe3O4 aerogel, 3D grapheme / PAA elastic conductor, and 2D centimeter-sized ultra-thin dried foam films of graphene.Then the as-prepared materials were used for supercapacitor and Li ion batteries, and also used as a transparent and electrically conductive film to replace of ITO.The new developed methods to prepared the various kinds of graphene-based materials will be helpful for new devices of energy conversion.