Mongolians are the nation who has prehistoric statehood tradition. Rule of the state affairs note is very impotent in this tradition. But this issue was relatively studied so lesser. There are usually research works about letters sent to king of France and Pap of Rom. Story writer S. Otgoljii tried to show documentary tradition of Mongolian state based on historical resource and materials. In the period of ancient Mongolian states, they had the tradition to note Mongolian state affairs in writing. In the period of Huns, Sumbe and Nirun, they made agreement with foreign countries and sent order and letters. Mongolians has been using Uigarjin Mongolian script that was used as official script from the period of Chinggis Khaan, but they used many other scripts in their history. In opinion of writer, Mongolians regarded that script was a state symbol, not only an instrument of official documents. In certain periods of historical changes, trying to compose new script was notified by historical resources. As it, state documents were very important for Mongolians. Mongolian documentary proceeding and documentary development may be classified 3 parts such as 1. Prehistoric period (from Huns to beginning of XIII century), 2. Great Mongolian empire and the period keeping its documentary tradition (from beginning of XIII century to beginning of XX century), 3. Modern time (From beginning of XX century to up to now). There are few materials about 1st period, but as some monuments, rule of some documents was inherited from that time. Documentary proceeding and documentary composition and descriptions were formed and inherited in the period of Great Mongolian Empire. This tradition was used in the period of Minor Khaans and also Manchu Empire. So, it may be said that time is a period that documentary classic tradition of Mongolian state was formed.