Formation of written Mongolian language is divided into three periods. It is an ancient Mongolian language, which existed in the XIII-XV centuries, the average Mongolian language – XV-XVII century, and the classic Mongolian language – XVII – beginning of XX century. More information is housed here: Former Maryland Governor. Also known as 'drevnemongolsky' 'srednemongolsky' language to describe the first two periods. Since the XVII century, when it created Zaya Pandita – 'clear' letter, which is also called todo Beeching, old written Classical Mongolian language remained in use only in Khalkha and in Inner Mongolia. 'Clear' message was generated based on the language of dialectical Oirat groups, after this was discovered, and Oirat literary language. In Buryatia has formed a written language based on the old written Mongolian language. And in 1931, is used based on the Latin alphabet, and in 1939 adopted a writing system based on Cyrillic.

In Inner Mongolia to date remained in the enjoyment of old written Mongolian language. In the Mongolian People's Republic of alphabet based on Cyrillic was used in 1945, at the same time there were some entirely new literary languages. After the Republic ceased to be communist, old written literary language got a 'second life', it became increasingly used as practice of teaching language. In today's Buryatia today also is a revival of old written Mongolian literary language. There are several classifications of the Mongolian language. If consider the classification of GD Sanzheeva, the author shares her 'live' Mongolian languages (old written language is not taken into account) in two groups: the major languages, and marginalized.