In recent years, demand of a Magnesium alloy is increasing as a lightweight material. However, forming of Magnesium alloy in room temperature is difficult. Therefore, development of new Mg alloys and new forming methods are under investigation. In this research, the explosive forming method is used for the forming AZ31 Magnesium alloy. The explosive forming method is one of the high velocity forming methods, which enables achieving a high plastic deformation for some alloys. The purpose of this research is development of a device that can safely do the high temperature explosive forming.