During the Wei, Jin, Southern and Northern Dynasties, due to the turmoil in the Central Plains and the separatism of Hexi, the Silk Road was blocked.Merchants from the Western Regions stopped at HeXi Corrido, making it an international trade center in the early years of the Sui Dynasty.In 609 AD, Emperor Yang of the Sui Dynasty went west to conquer Tuyuhun, which invaded HeXi Corrido, and held a diplomatic and trade alliance meeting in Zhangye.The Silk Road connecting the Central Plains and the Western world was once again open.