The main contents of this book include: the political exchanges between the Sui and Tang Dynasties and the Central Asian countries, the geographical scope and historical and social conditions of the Central Asian countries, the Sui and Tang Dynasties’ management of the Western Regions and the political exchanges with Central Asia, the transportation between Chang’an and Central Asia in the Sui and Tang Dynasties, Sui and Tang Chang’an Central Asian people and their descendants, texts and epitaphs found in Sui and Tang Chang’an Central Asian people and their descendants, the origin and activities of Sui and Tang Chang’an Central Asian people, and Sui and Tang Chang’an Central Asian people living together and sinicization and so on.