The Thirteen Classics gradually developed from the Five Classics of Han Dynasty and finally formed in the Southern Song Dynasty. The earliest Confucian classics in the Han Dynasty are called Six Classics, which are Yi, Shu, Shi, Li, Yue and Chunqiu. Jing Yue was lost long ago, so there are only five classics. Among them, Yi, Shu and Shi had been circulated long before Confucius and were quoted many times in Zuo Zhuan. Li is a summary of social etiquette at that time. I don't know when it was written. According to legend, Confucius used these four books as teaching materials when he was founded. (Accordingly, these four classics were of practical significance at that time. According to Zuo Zhuan, people at that time had to make predictions before making major decisions. This book mainly records the words, decrees and important deeds of ancient kings, and is a historical book. Poetry is also called Poetry 300. At that time, poems were often presented in social occasions to express their feelings, and their meanings were expressed by reciting different poems. "Li", that is, "Li", is the regulation and explanation of various ceremonial ceremonies at that time, such as adult coronation, funeral and funeral. It has practical significance, and mastering these is also the requirement of society for a qualified taxi at that time. Spring and Autumn Annals is the general name of history books of all countries at that time, and Spring and Autumn Annals is the legend of Lv Chunqiu edited and revised by Confucius, in which exquisite words and righteous deeds express Confucius' praise and criticism of history.
By the time of Emperor Wu of the Han Dynasty, Confucianism was regarded as the official ideology. After Baijia was deposed, the Five Classics was listed as an official school and a doctor of the Five Classics was established. The Book of Changes, The Book of Songs, The Book of Rites and The Spring and Autumn Annals were upgraded from Confucian textbooks to classics, which were officially called the Five Classics. Among them, in the book Chunqiu, scholars in Wei and Jin Dynasties attached the biography of Chunqiu (biography, that is, the words explaining the classics) to the classics for convenience, and the classics of Chunqiu were no longer a single line.