Introduction to the inner house gate: In order to maintain contact with the outside world, there are two types of messengers at the inner house gate, one is called Chaben and the other is called inner messenger. There are more than a dozen of them, who take turns in the ear room next to the door. On duty, delivering messages to the outside and inside at any time. On the west side of the door, there is also a special water tank exposed outside the wall - Shiliu. The government stipulates that water bearers are not allowed to enter the inner house. They only pour water into the tank and into the inner house through the partition wall.