Along with the sharp decrement of oil and gas resources on land and in neritic regions, offshore oil and gas exploration has been developed to the deep water, especially the depth of 1500~3000 m. Therefore, the requirements of materials with light weight and high strength which can withstand harsh marine environment are imminent. Fiber reinforced composite is one of the best choices for the exploration of subsea oil fields because of its advantages including light weight, high strength, corrosion resistance, and fatigue resistance. The applications of fiber reinforced composites mainly focus on the tensile armour layer of unbonded flexible riser and the rehabilitation offshore steel pipe. In addition, fiber reinforced composites are widely used in the oil sucker rod and mooring system. The fiber reinforced composites can provide reliable material support for the development of oil and gas field in deep water.