Abstract: A space solar power station (SSPS) is a huge space system. The conception of the SSPS was proposed by Dr. Peter Glaster in 1968. Due to various technical difficulties, it is estimated that the SSPS may not be practically realized in at least several decades. Japan has already put forward a plan for realizing a commercial SSPS in 2040. The concepts of a typical space solar power station and the key technologies are analyzed in this paper, and the key technical framework and the developing proposals of the SSPS are put forward.