The Ritsuryo system was revised during the reign of every successive Tang emperor, and "Kaigen nijugonen Ritsuryo" distributed in 737 during the reign of Emperor Genso was followed in the East Asian countries.
その後も代々改正が加えられ、玄宗(唐)朝の開元25年（737年）に頒布された『開元二十五年律令』は、東アジア諸国でも踏襲された。