Guizhou is the center of the southwest border, strategically speaking, it has the function of expanding the southwest. History has proved that Yelang in Guizhou is the crossroads of the Southern Silk Road, which runs through the east, west, north and south. Since ancient times, it has been a battleground for military strategists and the only way for business travel. It is the only shortcut for Chang 'an in Han Dynasty to exchange gifts and ambassadors with the southwest border, Annan, Myanmar, Siam, India and other countries. Wang Anyang of Shu led the rest to Vietnam, while Zhuang Qi, the general of Chu, fought for power and profit in Yunnan. The contribution system of Tang and Meng became more and more important, so Zhang Qian should explore the Southern Silk Road! After the continuous attention and management of the Han Dynasty, the Southern Silk Road finally became a thoroughfare. There is a couplet on the Zhu Sheng Bridge in front of Qinglong Cave in Zhenyuan, Guizhou Province: "Sweep away all the smoke in Wuxi, and Han will make the floating raft fight out;" After splitting the heavy post road, Burmese rode elephants across the bridge. "This is a vivid portrayal of the Southern Silk Road since the Han Dynasty.