According to Tianyan's data, Yushan Island Zhejiang Petrochemical Company was built by private investment, and it is a profit-making business place.

Dayu Mountain, known as Yishan in ancient times, is located in the gray turtle ocean in the northwest of Daishan Island, 24 kilometers east of Gaoting Town, with an area of 8.44 square kilometers, undulating hillside, deep soil layer and forest coverage rate of over 40%.