The creation time of the four Dai languages is still inconclusive. (1) Dai language is generally considered to be used in13rd century. However, judging from the social and historical situation and writing of the Dai people in Xishuangbanna, it may have been written earlier, and some people think it was between the 6th and 8th centuries. At first, this character was only 4 1 letter, which was consistent with the pronunciation and order of Pali letters. Later, according to the characteristics of Dai language, 56 letters were added, among which 48 consonants were divided into two groups according to the spelling tone, each with three tones and only two tone symbols. The other eight letters represent seven vowels and a vowel ending in a consonant. Vowel letters and vowel symbols are written on the top, bottom, left and right of consonants, and tone symbols are written on the top of words. ② Dai, founded in14th century. There are 19 consonants and dozens of letters and symbols, representing single vowels, complex vowels and vowels with consonants respectively. This writing often uses the same letter to represent different phonemes, and also uses several letters to represent the same phoneme, without tone symbols. ③ The Dai language, which is the same as the Shan language in Shan State, Myanmar, is similar to Dai Wenna in writing system, with only 18 consonants. ④ Jinping Dai language has 44 consonants (and several homophones), which can be divided into two categories according to the spelling tone. The expression of vowels in the latter two languages is also complicated. Due to the lack of historical materials, the age of his creation remains to be verified. There are many combined characters and fixed characters in these four Dai languages, and there are certain norms in calligraphy. Dai language and Na language are widely used, with rich literature, including political history, legal ethics, religious classics, astronomical calendars, irrigation and water conservancy, divination, story lyrics, literature, military science and other works, as well as some historical novels translated from Chinese, Beijing opera and Yunnan opera and literary works translated from India. These documents are written on locally made cotton paper. In Xishuangbanna, there are 84,000 volumes of Bayeux Sutra written on Bayeux in Dai with an iron pen. Dehong and other places also have a small number of Dai Yan Bei Ye Jing. In the past, foreign missionaries used to print Christian gospels in Dai language in Bangkok, and also printed hymns in Dai language with staff lithographs. However, because Christianity is not widely spread among the Dai people, these printed materials rarely circulate in China.
Generally speaking, Dai language works do not indicate the author and writing year. At present, the earliest written date is the Dai Poetry in 976 (16 14), and the earliest Bayeux Classic is collected in the China History Museum and engraved in the Dai Calendar in162 (65438).