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A new multi-level analysis method of introducing the super-element modeling method,derived from the multi-level analysis method first proposed by O.F.Hughes,has been proposed in this paper to solve the problem of high time cost in adopting a rational-based optimal design method for ship structural design.Furthermore,the method was verified by its effective application in optimization of the mid-ship section of a container ship.A full 3-D FEM model of a ship,suffering static and quasi-static loads,was used as the analyzing object for evaluating the structural performance of the mid-ship module,including static strength and buckling performance.Research results reveal that this new method could substantially reduce the computational cost of the rational-based optimization problem without decreasing its accuracy,which increases the feasibility and economic efficiency of using a rational-based optimal design method in ship structural design.