The superconducting generator using super conductors in field winding is superior to conventional generator in terms of power system stability, generator efficiency, generator dimensions and weight. They have been expected as a key generator technology to realize large capacity more them 1GVA.. Recently for then advantages are pointed out compared to conventional generator like small internal impedance that is effective to make system voltages in deregulated power system. These technical merits have pushed the development of superconducting generator in Japan, US, Germany and other countries. This paper covers the structural details of rotor and stator, the working and the cooling system for super conducting field windings. Also the main features and research and development on super conducing generator are covered briefly. . Fundamental technology for higher density and larger capacity is now under research. It is expected that superconducting generators becomes superior to conventional generators from economical and performance point of view. Superconducting generators are useful for solving problems appeared in power system and they are expected to the major source of electrical power in the coming decades.