The Tang Dynasty was culturally open, economically prosperous, militarily powerful, prosperous and had a solid material foundation. It is in the leading position in the world in culture, material and overall, and the spiritual civilization established on this basis has a solid foundation. At the same time, foreign social systems are in the process of transformation and growth-for example, Japan is changing from a slave society to a feudal society-and a complete social system superior to the feudal system of the Tang Dynasty is not yet mature. Its own cultural openness, xenophobia and fear have been greatly alleviated, and its powerful national defense force has also enhanced its transportation and maritime transportation capabilities unprecedentedly. Cultural exchanges with foreign countries are very rich.