Screen door introduction: The screen door is a barrier from the lobby to the second hall. There is a small courtyard in front of the door, and there are four huts on both sides of the corridor, where the Yamen servants wait. The screen door has a black painted panel door in the front and a lattice door in the back. There is a plaque hanging on the north side of the lattice door, with six golden characters "Heavenly principles, national laws, and human feelings". It is only for county magistrates and superior officials to enter and exit. When officials and servants pass through the door, they can only pass through the corridors on both sides.