The library of Fan Qin before the completion of the Dongming Caotang Department Tianyi Pavilion. Fan Qin, the word Yuqin, Dongming, so the self-titled library is "Dongming Caotang" (Dongming Caotang is now the architectural department of 1980 reconstruction), as part of the Tianyi Pavilion, can also be said to be the predecessor of the Tianyi Pavilion. Fan Qin's Sexual Happiness collection, during the period of officialship in various places, every place, special attention to search for visits to collect local literature. Fan Qin attaches great importance to the works of contemporary people, and the collection is mainly inscribed. He has a fellow friend Fengfang, also a collector, and the two have a close relationship. After Fengfang's library unfortunately suffered a fire, Fengfang was deeply hit, and the book collection was discouraged, and the rest of the life after the robbery was given to Fan Qin. These books were collected by Fan Qin in Dongming Caotang, and more and more books were collected. Dongming Caotang could not accommodate them. Fan Qin decided to rebuild a book building on the east side of the residence, which was later known as Tianyi Pavilion.