Yuhai Building is located in the northeast of Rui'an Ancient City in Zhejiang Province, one of the famous collections in southeast China. Yuhai Building contains Sun Yuren's former residence and Bai Jinzhai. It originally covers an area of about 8,000 square meters. It is surrounded by water on three sides and two inches before and after. This building was built by Sun Yiyan and Sun Yuzang father and son in 14 years. Yuhai Building was listed as a key cultural relics protection unit in the country by the State Council in 1996, and was named the Zhejiang Provincial Patriotism Education Base in 1997.