Introduction to the Garrison Office: The Garrison Office is a four-entry enclosed courtyard facing south, covering an area of ​​3210 square meters and a construction area of ​​1043 square meters. The name of garrison began in the middle and late Ming Dynasty, including Zhongjun garrison, Zhangyin garrison, etc. They were military attaches of the fifth rank, with more than a thousand officers and soldiers in charge. The Qing Dynasty still followed the Ming Dynasty military system and continued to establish it.