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The vehicle using compressed natural gas (CNG) trend to be extended in use internationally as optimal counterplan for reducing discharge gas of light oil due to high concern about environment. However, because NGV (Natural Gas Vehicle) is equipped with composite pressure vessel (CPV) and the CPV contain compressed natural gas, the risks in the case of accident is very high. The main cause of rupture accident for NGV is due to the defect of heat treatment for the vessel at the manufacturing stage and the rupture characteristics vary greatly depending on the heat treatment conditions. In this study, explicit dynamics analysis was performed to evaluate the bursting characteristics of the CNG pressure containers by heat treatment. Explicit dynamics analysis is numerical analysis method applied to the large deformation analysis that occurs instantaneously such as collision and explosion. The condition of the defect for heat treatment is that quenching and tempering temperatures applied to the normal vessel were adjusted and explicit dynamics analysis was performed using AUTODYN for each case. It is possible to understand how important the heat treatment process is in the high pressure vessel unlike any product.