Peak acceleration on product by package drop test should be less than the critical acceleration from damage boundary curve of products. Conventionally cushioning package is redesigned when the peak of shock pulse at drop test becomes bigger than the critical acceleration due to expect the product damage. However this judgement of damage condition for product is premature because the shape of shock pulse between drop test and shock test for damage boundary curve is different. In this paper, the new evaluation method of cushioning package using damage boundary curve derived by the shock pulse when drop test has been considered. Using this proposal method, the damage condition of product can be defined clearly compare to classical way. It means that we can recognize the safety area without any damages even if the peak acceleration by drop test is bigger than the critical acceleration. On the other hand, the damage area even if the peak acceleration by drop test becomes lower the critical acceleration is found by using the proposal method. Therefore, the proposal method will contribute the optimization of package design.

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