The measures of its "Four Courses" enrollment system are as follows: First, the imperial academy is established to govern six schools: Guozi, University, Four Courses, Law, Calligraphy and Mathematics. Second, according to Selected Records of the New Tang Dynasty, in the Tang Dynasty, "all students are limited to over 14 years old but under 19 years old, and the law is over 18 but under 25 years old." According to imperial academy in the Six Classics of the Tang Dynasty, there are 500 people in four subjects, who were selected as "civil and military officials with more than seven grades, Hou Bozi as a man" and "Shu Ren as a gentleman". Third, in the seventh year of the reign of Emperor Xuanzong of the Tang Dynasty, it was promulgated that "those who have learned the history of literary words without passing the classics are men of four subjects." In this way, the total number of students in the four courses has increased to 1300, of which 500 students are selected according to the same criteria as the Six Classics of the Tang Dynasty, and the remaining 800 students are "Shu Ren's handsome and unique". In May of the 21st year of Kaiyuan (733), Emperor Xuanzong of the Tang Dynasty issued another edict: "Students in Zhuzhou County, under the age of 25, have eight products and nine products. The weak are born at the age of twenty-one. Scholars with literature and history who have passed the selection every year and failed the spirit of enlightenment will be tested briefly in different subjects and admitted to four subjects to be gentlemen. In other words, people of all colors are reluctant to go to school. Listen. "
Judging from the "four subjects" enrollment measures in the Xuanzong period of the Tang Dynasty, the admission qualifications were relaxed, and the requirements of age, father's rank and classics were lowered. Those who failed the rural examination could also be selected. Reform the way of selecting talents, from a single examination of Confucian classics to a concurrent examination of literary history; The enrollment scale has been expanded from 500 to 1300.
Because the enrollment system of "four courses" takes care of the interests of middle and lower officials and eases the contradictions within bureaucratic groups; It promoted the rise of the elite among the civilians and was conducive to restraining the gentry; Promoted the prosperity of literature, history and other cultural undertakings; It has promoted cultural exchanges between China and foreign countries and expanded Tang Wenhua's influence in East Asia.