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Beginning from the Middle Ages the Mongols, who perhaps are known do the reader best of all the nomads, have been one of the most popular and productive topics for historians and writers of the world. Certainly it is explained by aggressive wars of Genghis Khan and his successors in the 13th–14th centuries A. D. which shook the world of those times. The bulk of this great a number of works is devoted to Genghis Khan and other Mongol khaghans, noyans and their military campaigns against remote countries, but to the Mongols as a genuine people.

In particular, numerous works on the Yiian dynasty (1260–1368), often treat the history of the Mongols of that period as a history of China. Both old and modern Chinese literatures regard the Yiian dynasty as one of the Chinese dynasties. Nowadays some of the Chinese historians have even come to proclaiming all great khans of the Mongol Empire «Chinese emperors out of national minorities», who accomplished «he first great unification (ta t'ungyi)» of the — empire since the Han and T'ang. In fact, as is well known. China of that period was deprived of its sovereignty. The country was ruled by the alien Mongol dynasty founded in 1206 by Genghis Khan and which by 1271 became known as Yiian and was part of Mongol empire.

As is evident from the title this work attempts to give the history of Mongolia proper of that period which was the main part of the Mongolian Yiian Empire, and whose vast territory stretched from the Hingan mountain ridge in the east to the Altai mountains in the West.

The introductory part of the work characterizes the sources used by the author. Most of them are originally Chinese. Undoubtedly the Yiian shih, compiled in 1370, is the most important source for a student of Mongol history. In this connection I would like to note that this bulky work consisting of 210 chapters was completely translated into Mongolian in 1917–1928 by Cimidiin Demcig-Dorje (1863–1932) known in Mongolia under his literary name C. Dan-da.