Hengyang is situated in the south of the Hengshan Mountain in Hunan province, which is said to be the vein of dragon. Because of its particular location, it is important to lock the eye of the hole. That is built some pagodas or other buildings in the mouth of the river. Three pagodas, including the Laiyan Pagoda, Zhuhui Pagoda and Jielong Pagoda, were built to lock the eye of the river, which makes the Hengyang city as one of the famous city with good feng shui in China.