Introduction to the Fourth Teaching Hall: The Fourth Teaching Hall is located in the center of the garden. It is built in the style of a four-sided hall, so it is also called the four-sided hall. It covers an area of ​​about 250 square meters. The hall faces south, has five bays, has a brick and wood structure and is in the shape of a cross. The doors, windows, beams, columns and eaves around the hall are engraved with reliefs of historical stories of "Wen, Xing, Loyalty and Faith", with superb knife skills and exquisite patterns.