In 645 (the 19th year of Zhenguan), Emperor Kotoku of Japan implemented the "Dahua Reform". Gao Shangxuanli and others who had studied abroad for a long time in the Tang Dynasty were appointed as doctors of the country to participate in state affairs. Economically, they nationalized the land according to the Tang Dynasty's land equalization system and rent-and-yong modulation, and implemented the land collection and grant law and the rent-and-yong modulation. Politically, the administrative agencies were reformed based on the official system of the Tang Dynasty. The contents of the reforms were basically similar to the system of the Tang Dynasty.
In terms of architecture, the buildings of Japan's capital "Pingjing Castle" (Kyoto), palaces, and temples are all imitated in the Tang style. The cityscape and streets of Kyoto are the same as those of Chang'an, and there are also "Suzaku Street" and "East City" , "West Market" and other names.
In terms of writing, Japan used Chinese characters as a tool to express descriptions before the 8th century. The foreign student Yoshibe Mabei created the "Katakana" script based on the regular radicals and crowns of Chinese characters, and the scholarly monk Kaiku created the "hiragana" character using the cursive script of Chinese characters. The creation of this new style of writing is conducive to the development of Japanese culture.
During the Tang Dynasty, Chinese people also continued to travel eastward to Japan, including envoys, monks and businessmen, who played a large role in Sino-Japanese cultural exchanges. Among them, authenticity appraisal is the most famous. Jianzhen (AD 688-763), a native of Yangzhou, with a common surname of Chunyu, was a famous Buddhist Vinaya master. In 743 (the second year of Tianbao), he traveled eastward to Japan at the invitation of the Japanese scholar Rongrui and Puzhao. After six attempts, he went through many hardships and became blind, and arrived in Japan in 753 (the twelfth year of Tianbao). Jianzhen is knowledgeable and has a great influence on Japanese Buddhism, architecture, sculpture, art, medicine, etc. Under his design and guidance, Tangshodai Temple was built in Nara and some Buddhist statues were created. He also identified many Chinese herbal medicines for Japan and wrote the medical book "Jian Master's Secret Recipe", which made contributions to the development of Japanese medical prescriptions.