Abstract: Optimum design of erecting system was analyzed from the points of view of rapidity and acting force, and the objective function of optimization wa s established. Each objective function was nondimensionalized, and the multiobje ctive optimization function was solved by conventional weighting method. Sample point was appointed by uniform design. The polynomial response surface model was set up based on sample experimental data of collaborative simulation. Multidisc iplinary design optimization of the position of key pivots on some erecting syst em was carried out. The polynomial response surface method was compared with con ventional multiobjective optimization method through the evaluation function con structed. It shows that the polynomial response surface method is effective by a nalyzing the difference between the two methods. This method is a favorable tool for further development and design of erecting system.