Thework aims to study the mechanical characteristics of the inner package of circular cabinet air conditioner under static load based on the finite element software, and carry out multi-objective optimization design. A three-dimensional model was established by CREO and a finite element model was established by ANSYS Workbench to carry out static analysis on the inner package of circular cabinet air conditioner. The multi-objective optimization model was established with the thickness of 5 ribs and 2 side walls of the upper cushion as design variables and the mass of the upper cushion, maximum deformation and maximum equivalent stress of the package as the objective functions. Based on OSF experiment design method and Kriging model, multi-objective optimization design was carried out by multi-objective genetic algorithm. The maximum deformation of the package before optimization was 1.511 3 mm, and the maximum equivalent stress was 0.327 6 MPa. After optimization, the thickness of the ribs and side walls of the package decreased significantly, the mass of the upper cushion decreased by 27%, and the overall strength did not decrease significantly. The multi-objective optimization design method established is reasonable and the Kriging model has high accuracy. On the basis of ensuring the cushioning protection effect, the lightweight design is realized and the packaging cost is reduced.