In this paper, we investigated the design method of mooring system in ultra deep sea and carried out the conceptual design for offshore West Africa oil field in ultra deep sea of 3000 meters. Recently, it was feasible to design and install the offshore floating structures in deep sea of up to 2000 meters. Due to the simplicity, two-point mooring design is fully utilized. Force-excursion curves are throughly examined to find out the feasibility of various combinations of mooring lines. Free

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... h and pretension effects are discussed. It is found that composite materials including synthetic fiber rope may be good solution for ultra deep sea mooring design. ※Keywords: Ultra deep sea mooing(초심해계류), Mooring design(계류계 설계), Free length(자 중파단길이), Pretension(선인장력), Synthetic fiber rope(합성섬유로프), Composite material(복합 재료), Two-point mooring(이점지지계류), Force-excursion curve(복원력-변위곡선), Multi-point mooring(다점지지계류) 1. 서 론