When Bai Juyi, a poet of the Tang Dynasty, was the governor of Hangzhou, he wrote in a poem: "I love the lake I love the most when it goes eastward, and the white sand embankment in the shade of green poplars." This refers to this embankment. In order to commemorate the poet, later generations called him Bai Di.

Hangzhou West Lake Sudi was formed in the fifth year of Yuanyou (1090) in the Northern Song Dynasty when the poet Su Shi (Dongpo) was the magistrate of Hangzhou. In order to commemorate Su Dongpo's achievements in managing the West Lake, the people named it "Su Causeway".

Detailed analysis:

Baidi, formerly known as Baishadi, was built to store lake water for irrigation of farmland. In the past, the ground was paved with white sand, but now it has been replaced by asphalt. As early as more than a thousand years ago, the Tang Baidi Panorama Dynasty was famous for its beautiful scenery. People thought that Bai Juyi presided over the construction of this embankment, so they called it Bai Di. In fact, when Bai Juyi was appointed governor of Hangzhou, he built a dike near the old stone culvert bridge outside Qiantang Gate, called Baigong Dike. There is no trace of it now. Although the Bai Causeway that people know today is not in the same location as the Bai Causeway built by Bai Juyi, the people of Hangzhou still named it Bai Causeway in memory of this "old mayor" who made outstanding contributions to Hangzhou.

Su Causeway was formed when the famous scholar Su Shi (Su Dongpo) of the Northern Song Dynasty came to Hangzhou for the second time to serve as an official. He directed more than 200,000 people to use the grass and silt accumulated during the dredging of the West Lake. Since the Southern Song Dynasty (13th century), "Spring Dawn on Su Di" has been the first among the "Ten Scenic Spots of West Lake". The long embankment runs through the north and south sides of the entire lake, adding a charming scenery to the West Lake. In the Yuan Dynasty, it was also called "Six Bridges of Smoked Willows" and was included in the Ten Scenic Spots of Qiantang, which shows that it has been loved by people since ancient times. The people of Hangzhou named it "Su Causeway" in memory of Su Dongpo's achievements in managing the West Lake.