According to the "County Records of Yongzheng Dynasty", "Woniu Mountain is a secluded place for Xu Chao, so there are historical sites such as ear washing pool and Petunia Lane in Chaocheng." The story of ear washing pool has a long history. According to legend, Xu You lived in seclusion in Mount Ji first, then lived in the nest, and washed his ears in the pool under Woniu Mountain to show his nobility. Just in time for Chao Fu to visit and drink cattle. After listening, he said, don't drink this water with the cow, and the cow will leave ... There is also a saying in Chaohu Lake that "a tower supports the sky and lies the cow, and the word in the pavilion is evening ...".