In the 1970 s of the construction of the base, located in the front of capital and underground hengwenku, changsha is the only key to unlock defence underground engineering. Mountains cover thickness of more than 20 meters. Atomic weapons design of library body, the high grade concrete casting, the thickness of a meter. In the constant temperature 18 ℃ to 18.5 ℃, humidity can be automatic control in the 45% to 70% as required. Excellent location advantages, is apart from the west on 400 meters, from the 319 national highway 3 kilometers, is apart from the often highway 5 kilometers long. Thanks to the constant temperature, dry, sealed, stationary, low oxygen (no light), and other natural advantages, become a cultural relics and treasures, archives, medicine, tobacco, cosmetics, alcohol, food, rice, precision instruments, such as storage option.