Abstract—As cars become one of the main means of transportation, accidents have accompanied car driving. In the event of an accident, the repair is carried out at a repair shop, and in the case of damage to major parts of the car’s body, the value of the car falls after the repair or concerns about its performance and safety arise, promptly causing distrust and anxiety over the repaired car. In this experiment, one high-selling passenger car is selected in the domestic market and a collision test is conducted in the same way as the actual vehicle, utilizing the drawings, materials, and relevant data of the car. The simulation identified the damaged area and condition in the same collision as in the actual crash, with the condition of the vehicle after the crash repair being interpreted and analyzed through a commercial program. The tensile strength test for the welded area confirmed that the material strength of the vehicle was reduced by 20% from the intact condition. The change in the stiffness in the vehicular body before and after the accident is compared to gather data for tensile strength, F-D diagram, and relative displacement. Judging from the stiffness and internal energy data, as well as the F-D diagram, the difference between the intact vehicle and the vehicle after the repair appeared in even a perfectly repaired car and this difference was determined to be the basis for the depreciation of value, meaning a change in the stiffness of the vehicle during restoration