During the Sui and Tang Dynasties, China and Japan had close contacts. During the Zhenguan period, many Japanese envoys, overseas students and monks came to study in the Tang Dynasty. After returning to China, the envoys in Tang Dynasty were highly valued. Taking the system of the Tang Dynasty as a model, they carried out political reforms and created Japanese characters with reference to Chinese characters. Up to now, they still retain some customs of the people of the Tang Dynasty in social life. Among the envoys and monks who went to Japan in the Tang Dynasty, Jian Zhen was the most influential one. He sent six missions to Japan to spread the culture of the Tang Dynasty in Japan.
Silla sent envoys and a large number of international students to study in the Tang Dynasty. Silla merchants came to China to do business, and Silla products ranked first in the Tang Dynasty. The Tang system established a political system, adopted the imperial examination system to select officials, and introduced China's scientific and technological achievements in medicine, astronomy and calendar calculation.
During the Xuanzong period of Tang Dynasty, there were frequent contacts with Tianzhu, and the most outstanding messenger was the monk Xuanzang. In the early years of Zhenguan, he set off from Chang 'an and went to Tianzhu. After returning to China, he devoted himself to translating Buddhist scriptures and wrote the famous "Datang Western Regions". This book is an important classic for studying the history and Buddhism of Central Asia, Indian Peninsula and Xinjiang.
During the Kaiyuan period, Chang 'an, Yangzhou, Guangzhou and other cities. The Silk Road has become an important channel to communicate the economic, cultural and political ties between China and foreign countries. Students from Asian countries come to China to study. Chao Heng, who had a deep friendship with Li Bai, was also a Japanese student studying in the Tang Dynasty. Many foreigners served in the court of Emperor Xuanzong of the Tang Dynasty. The envoys, monks and businessmen of the Tang Dynasty also emerged in an endless stream.
In the Tang dynasty, there was a crack temple to receive the guests of diplomatic envoys from various countries, and kiosks were set up in various places to entertain foreign businessmen, and mutual market supervisors and trading companies were set up to take charge of foreign trade. Chang 'an, Luoyang, Yangzhou, Guangzhou, Lanzhou, Liangzhou and Dunhuang are important foreign trade cities in the Tang Dynasty. Chang 'an is particularly famous, and guests gather all over the world. Many foreign businessmen run shops in the "West Market" and live there for a long time. Imperial academy accepted many foreign students, and as many as 4,000 to 5,000 "conference semifinals" stayed in Chang 'an.
Huineng, the real founder of Zen in China, died in the year when Xuanzong ascended the throne. Since then, during the forty years of Xuanzong's rule, Zen has risen rapidly, and the confluence of Confucianism, Buddhism and Taoism has become a historical trend. Xuanzong himself made notes in the Book of Filial Piety, Laozi and Diamond Sutra. The so-called three religions, namely Zoroastrianism, Nestorianism and Manichaeism, were also circulated in China. It is such an open society that makes the Tang Dynasty appear generous in social atmosphere. Li Bai's confident poem "Since God has given talents, let it go and be hired!"! , spin a thousand silver, all come back! " It is a portrayal of the spirit of that era.