|Taking multifunctional bed as an example, the lightweight design of multifunctional modular furniture was studied. The ANSYS Workbench software was applied to the main frame of multifunctional bed, which took the wall thickness of square pipe as design variable, the maximum total deformation and equivalent stress under load as constraints, and its quality as objective function. The lightweight design was carried out, and a set of reasonable lightweight design schemes was selected after comparing and optimizing results. The scheme reduced the quality of the main frame by 8.976 kg and the reduction range by 34.15%. The purpose of product lightweight design was realized.