The work aims to optimize the design of freezer packaging structure to ensure that the freezer is not damaged during transportation and handling. Firstly, theoretical analysis of freezer drop impact was carried out, and then three-dimensional modeling was carried out by Solidworks. The model was pre-processed by Hypermesh, simulated by LS-DYNA based on finite element method, and post-processed by LS-PrePost. The simulation results showed that, plastic deformation would occur in some structures of the freezer. Aiming at this problem, the support structure at the bottom of the freezer was improved. After the improvement, the deformation of the vulnerable parts was reduced by 1.87 mm. Hypermesh and LS-DYNA used to simulate the freezer drop can enable the designer to detect the change characteristics of the product inside after impacted, predict the design defects, and correct the defects. This can not only ensure the quality of the design products, but also greatly reduce the production cycle and save costs, and has a wide range of market promotion values.