Yanggongdi is one of the "West Lake Three Dikes" with the name of Baidi and Sudi. Because Yang Mengxuan presided over the excavation, it was named Yanggongdi. Yanggongdi is located in the west of the West Lake. There are six bridges on the embankment. Kangyou was famous in the "desolate white horse city Zhongxu, dreaming into the West Lake number six bridges. Who can see the great river and mountains? The sound of the waves broke the tide in Zhejiang. Just written in the second time, Ming Xu ruled for 16 years (1503) and became Hangzhou Zhizhou. At that time, the West Lake was silted, and Yang Mengxu carried out dredging, clearing nearly 3,500 mu of fields formed by the water surface of the West Lake, and building a north-south direction on the Xili Lake with dredging and grass. From the north, Renshou Mountain, Maling Mountain foot, south to Chishan Mountain, Qianliangsi Lingdong, connecting Dingjia Mountain, Mianniu Mountain, etc., the sixth bridge was built on the embankment. The latter people commemorated Yang Mengxuan, calling this embankment "Yanggong Dike", and the sixth bridge on the embankment was "Liliu Bridge".