Wireless electric power transmisson consists of microwave sources or lasers,transmitting and receving antennas,microwave or laser rectifier,etc.,among which the most important device is the rectifier that converts microwave or laser energy into direct current. This is a new and non-traditional method that in general is applied to some special cases, for example,lower military satellite, directional energy weapon in outer space, microwave airplane, solar energy satellite power station,etc.in all fourteen new,significant and potential fields of science and technique.