The technical index and performance requirement of main body packaging material for certain protection device was put forward according to the overall performance requirement of the device, the environmental condition of carried ammunition, and packaging protection requirement of ammunition. Structure design and process of a newly developed material was introduced together with the development of current envelop material and composite technologies. Experiment results showed that the newly developed material is soft, high insulation, and light weight, which can meet the requirement of protection device on main body packaging material.