The rotating butt skirt is works in the deep water area of the ocean,In order to solve the safety problem of rotating butt skirt working in deep water,In this paper,fixed skirt,direction skirt,angle skirt was took as the research object.Multi-Objective Genetic Algorithm is used to optimize the key parameters of fixed skirt,direction skirt and angle skirt,and we get the optimal parameters of the three. The results show that the optimized fixed skirt reduces weight by 9. 76% after optimize,optimized direction skirt and angle skirt reduces weight by 13. 56% after optimize. And the fixed skirt,the direction skirt and angle skirt after optimized are meet the design requirements. Finally,the three-dimensional model of the rotating butt skirt was established by using the optimized data,and the test prototype was made,which laid the foundation for the subsequent sea test.