In ancient times, the dark warehouse was a secret grain storage warehouse, which was mainly used to store grain materials in secret in case of emergency. In ancient times, due to the adoption of agricultural production methods, the annual harvest situation was different, and the grain reserve was often unstable. In addition, there were frequent wars in ancient times, and the enemy often destroyed or robbed the enemy's grain when attacking, so the emergence of secret warehouses can guarantee national security to a certain extent.

There are three main architectural features of ancient hidden warehouses. The first one is buried deep underground, usually three or four meters, to ensure the safety of the granary. The second is careful design. Generally, the access to and from the warehouse requires multiple protections, such as doors, partitions and multiple entrances. The third is that the temperature is suitable. There are often vents in the granary, and the grain should be kept in a dry, ventilated and cool environment, so as to maintain the original nutrition and taste of the grain.

Ancient hidden warehouses played an important economic and military role at that time. It provides a real reserve force for coping with unstable situations and war hunger. At the same time, the construction of hidden warehouses has greatly improved the stability of agricultural production and guaranteed people's production and life. Today, in some rural areas of China, you can still see the remains and base sites of ancient hidden warehouses, which have become historical and cultural heritage and represent the ancient spiritual culture of China.