During the Sui and Tang Dynasties, China and Japan had close contacts. During the Sui Dynasty, Japanese envoys to the Tang Dynasty arrived. Since the Zhenguan period of the Tang Dynasty, there have been more than ten Japanese envoys in China, including overseas students and monks studying abroad. The members of the mission are of high quality, so as to better absorb the culture of the Tang Dynasty.

After sending Tang envoys back to China, they were highly valued. They carried out political reforms according to the system of the Tang Dynasty. The Japanese were deeply influenced by the culture of the Tang Dynasty. They created Japanese characters with reference to Chinese characters, and still retained some styles of the people of the Tang Dynasty in social life.

Japan's capital, Pingchengjing, has almost the same architectural style as Chang 'an in the Tang Dynasty.

The style of Japanese copper coins is similar to that of the Tang Dynasty.

Tang poetry is widely circulated in Japan, especially Bai Juyi's poems.

Japanese scholar-officials are keen on learning China's calligraphy.

Japanese courts hold banquets and love to use Tang-style dishes.

The Japanese learned and improved the method of drinking tea in the Tang Dynasty, and formed a unique tea ceremony.

The climbing custom of the Double Ninth Festival in Japan also originated from the Tang Dynasty.