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Tie down loading effect on the car body has been analyzed for various factors. Excessive force during transportation causes local failure or dent of a car body. In order to prevent local failure and to increase the tie down strength effectively, nonlinear finite element analysis was performed considering large deformation, rotation and elasto-plastic deformation. Location of dent was predicted which was the same as reported and it was found that there are two ways to increase the tie down strength: one is the application of the tie down load at the side of fuel inlet and the other is the reinforcement of rear floor side member. This paper demonstrates the displacement and the stress distributions for various locations and directions of tie down loading and the degrees of reinforcement of rear floor side member.