After two days of leisure in Dali, we set off again and went to Yongping, West Anhui. Known here as Bonan, the long southwestern Silk Road passes through the country and is known as the Bonan Trail. In the next few hundred years, the two silk roads in the north and the south echoed each other and shouldered the heavy responsibility of China's external transportation. The opening of the Bonan Trail is the unexpected harvest of Zhang Weis departure from the Western Region. From the very beginning, it was built on the same commercial road with a strong political color and far-reaching military objectives. Its opening has been realized. The original intention of the Han Dynasty, contact the Western Regions, and eliminate the threat of the Xiongnu. At the same time, it has become one of the earliest channels of economic trade with foreign countries in China. Through this road, we transported domestic goods such as crepe, bamboo sticks, silk, tea, tobacco, salt and Chinese herbal medicines to South Asia and even European countries. Hiking the Bonan Trail, you need to find a local guide. After we arrived at Maubao, we followed the guide and walked in Huasonglin. The virgin forest trees in front of us were mottled, and the fallen leaves covered the ancient roads tightly and stepped on the thick and soft.