what advancement was made in japan in the 600s - 700s CE

One major advancement made in Japan during the 600s - 700s CE was the development of a centralized government system. This system was based on the Chinese model of government and was known as the ritsuryo system. It included a complex bureaucracy, a legal code, and a taxation system. This system helped to unify Japan and allowed for the development of a strong and stable government.