For the exploitation of the huge ocean energy, development of Kuroshio current generator network system may be a chance for Taiwan. One of the biggest challenges of the ocean energy technology is how to moor the generators on the deep sea and resist the strong currents to keep them in right positions. This study explores different mooring systems for a pilot marine current power plant of 10MW located at 5km off shore. The feasibility of the design and construction of a mooring system for a current power generator of 1GW installed on a sea area of 25 square kilometers was considered. The design of the mooring system in this work contains two kinds of frame structures and a spherical-joint connected-pipe structure. The stress analysis for three designs were conducted to compare their advantages. The tension and the shape of the cable in the mooring system were analyzed to examine the mooring force of connected points and the floating condition of mooring structures.