PURPOSE: An infill structure of an offshore structure is intended to maintain the stability of an offshore structure for the operation period of the offshore structure. CONSTITUTION: An infill structure of an offshore structure comprises an infill plate(21). The infill plate is installed between a first module(20) corresponding to a lower support structure and a second module. A deck plate(22) is installed on the modules. A PTFE film(23) is applied to the lower surface of one side of the infill plate. The top of the first module making contact with the lower surface is hard-coated. Neoprene rubber is installed on the upper still surface of the second module after general coating.
