Yuhai Building is a building complex with southern Zhejiang characteristics. It consists of Yuhai Library, Sun Yirang's former residence and Baijin Taozhai, which are located on three longitudinal axes in the north-south direction, with a total area of about 8,000 square meters. Yuhailou is quaint, with lush trees and empty shade. The flowers and trees in the courtyard are fragrant and intoxicating. Yuhailou, the place where Sun Yirang collects books and writes, has a profound historical and cultural heritage, attracting many experts, scholars and people from all walks of life at home and abroad. For example, Guo Moruo, Hu Qiaomu, Fei Xiaotong, Xu Jialu and other national leaders visited and wrote inscriptions, and famous experts and scholars such as Mao, Luo, Shi Shuqing also visited, as well as experts and scholars from the United States, Britain, France, Germany, Japan, China, Britain and France. Professor Luo, a famous expert on ancient architecture, praised Yuhailou as a "national treasure". In 1996, Yuhailou was listed as a national key cultural relic protection unit by the State Council, and in 1997, it was named as a patriotic education base in Zhejiang Province. The front door of Sun Yirang's former residence is named "Platinum Lu Jing", and the couplets "A Song Yuan Residence, Jade Sea Book" on both sides are written by Mr. Sun Yirang. Sun Yirang's former residence has distinctive architectural features. The plane layout is composed of the gatehouse, the living room and the main building, separated by the patio, arranged on the same longitudinal axis, symmetrical left and right, and four pillars form a room, which inherits the traditional practice.

There is a garden in front of the platinum pottery house called Yiyuan. The four seasons in the park are full of flowers and trees, and the ancient trees are lush, which is a rare place of simplicity and tranquility. The lotus pond in the garden is cut through, and white lotus is planted, which blooms all the year round. Sun wrote the words "square stone forehead" on the handwriting on the original desk door. Here is a carved stone written by Guo Moruo in nave: "The study of Oracle Bone Inscriptions was created by Sun Zhongrong, followed by Wang Guantang, and the two gentlemen who thought about drinking water were unforgettable." Sun Zhongrong here refers to Mr. Sun Yirang. Next to it is a couplet written by Sun: "If you want to know as ancient as a king, it is especially enjoyable as water." This is from Sun's Shanxi school.

The living room is where Sun and Sun Yirang receive court officials and distinguished guests. At that time, both sides had banners of "avoidance" and "silence". Because the living room is a beam-lifting structure, it is often carved with beams and painted buildings, so it is also called the living room. But the living room here is simple and generous, which shows that Sun Shi is a fair official. Hanging on the living room nave is a large blue and gold plaque with golden moire on the outer frame, which is particularly eye-catching. It says, "Brothers revisited Dishui, Chen Yili, a scholar from Zhejiang in the 19th year of Guangxu". This plaque tells the story of Sun Yirang's father Sun and uncle Sun who were admitted to the Jinshi successively, and then revisited Kyoto after 60 years to attend the Jinshi Conference.

The main building of Sun Yirang's former residence was built in imitation of the quadrangle structure, with buildings at the front and back, wings at the left and right, and dragons and beasts on the roof, which is unique in the architectural style of large families in southern Zhejiang. The courtyard here is open, attracting southeast winds in summer, sunny in winter, pleasant flowers and plants, and very comfortable to live in. There is also a back garden with a building area of more than 3,000 square meters. Mr. Sun Yirang moved from the countryside to the county town of Pandai when he was a teenager, and only moved here at the age of 40. Many of his works were completed here, such as Mourning between Mozi and Justice of Etiquette. From 65438 to 0908, after Mr. Sun Yirang's death, his family fortune gradually declined, and Yuhailou and his former residence were also distributed to his five sons as property. After liberation, the people's government attached great importance to the protection of cultural relics, and invested millions of yuan in protection and maintenance for seven times. 1996, Sun Yirang Memorial Hall and Folk Cultural Relics Exhibition Room were opened.