Offshore oil platform mining bases need to be removed after being abandoned, wire saw is a new environmentally friendly underwater cutting tools, skills and information that can learn is very little in R & D, reasonable solution analyze is more difficult. The gray relation projection I-QFD-E method was analyzed, according to wire saw technology research and development indicators, wire saw quality elements were obtained, several feasibility was studied by using gray relation projection I-QFD-E method. According to the results, the best solution was selected, offshore discarded platform piles removal wire saw was developed.Experiments show that the wire saw achieve the expected requirements, which proves the approach rationality.