Answer: (1) established a complete feudal academic system from the central to the local. First, the central government set up imperial academy to manage all schools; Second, local schools, including state (prefecture) and county levels, are implemented as a unified educational system throughout the country; Third, professional schools have been stereotyped, and law, calligraphy, arithmetic and medicine have developed; Fourth, the forms of running schools are diversified; Fifth, the school's various systems, school administration and measures are becoming more and more perfect; Sixth, the feudal hierarchy of the official school system has been strengthened; Seventh, the teaching of Confucian classics, from writing to explanation, needs to be more strictly unified and standardized. (2) The relationship between schools and imperial examinations is extremely close. The selection of talents meets the standards and requirements of cultivating talents, and the school has become the preparatory organ and vassal of the imperial examination, which has become an important force leading school education. (3) Strengthen international communication through overseas students and "Tang envoys".