Abstract: This paper studies the full DC transmission scheme of 118 MWp photovoltaic power station in Xiaoyangshan Bodaozui island of Zhoushan, Zhejiang Province. The construction principle of the full DC transmission system is introduced, and the key technical issues such as the topology selection, the grounding method, and the DC voltage control are clarified. The composition principle of DCDC converters at all levels is specified. A corresponding simulation system is built on the PSCAD/EMTDC platform and the time-domain simulation verifies the feasibility of the proposed full DC transmission scheme of 118 MWp photovoltaic power station in Xiaoyangshan Bodaozui island.