Qabutu Qasar was a legendary figure and hero in history. Since the 17th century,the legend of Qabutu Qasar has been widely spread in Mongolian documents as well as among Mongolians. It can be divided into positive and negative legends and in both of them his image is related with his personality,physical and spiritual features,history and Genghis Khan,all with historical origins. The legend is not only historical document of a high value,but also an important way to inherit Mongolian history.