Introduction to Zaijitang: It was the place where Su Dongpo lived and gave lectures when he was demoted to Changhua Army (now Danzhou City). "The Recorded History of Qiongtai" records: "Dong Su Wenzhong of the Song Dynasty was relegated to Dan'er. He gave lectures and enlightened the Tao, and education flourished day by day. The prosperity of Qiongzhou's humanities was actually started by his father."