Disclosed is a rebuilding method of an LNG carrier capable of supporting resources to a floating offshore structure. The rebuilding method of an LNG carrier capable of supporting resources to a floating offshore structure selectively operates a used LNG carrier or generates power by connecting a generator to a steam turbine engine of the used LNG carrier, and supplies one or more from power, natural gas, and high-pressure steam between the used LNG carrier and a floating offshore structure by connecting the used LNG carrier and the floating offshore structure to each other using a composite cable.
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