Rot refers to the weathering of substances from the inside out due to long-term wind and rain or bacterial mildew. Then the way to keep things from rotting is to ensure that they are not eroded by wind and rain and invaded by bacteria. Grain storage is more exquisite, especially in this granary in Sui and Tang Dynasties, including Jiacang, which can still ensure that the grain in the granary does not rot, and it must be carried out under good conditions to maintain its storage.

Hanjiacang in Luoyang, Henan Province has a high terrain, so it is not easy to hoard near grain when it rains, so that grain is eroded by water. In addition, the granary is far away from the underground river water level, which plays a deeper protection role, making the soil near the granary relatively dry, which is not easy to cause grain mildew and can be preserved for a longer time.

According to historical records, the place where the barn is built has a unique wallboard setting. The cellar for storing grain is baked with fire before storing grain, which not only makes the soil layer dry and not easy to be wet, but also has a certain high-temperature sterilization effect, which plays a good infrastructure role for subsequent storage of grain. In addition, if the wallboard built near the barn is separated, it will not cause a "chain reaction" of grain and damage more grain, which shows that people were "prescient" at that time.

It can be seen that the ancients had summed up a lot of experience in their own farming activities at that time, and also had their own set of skills in grain storage. Therefore, these grains can be preserved to this day without decay because they have not been eroded by wind and rain and bacteria for a long time and have been well protected.