《蒙古秘史》是记录成吉思汗历史与生活的第一部著作。而有关其成吉思汗的记述中时而伴随着文学夸张与虚构，对正确理解成吉思汗历史带来一定的困难。因此，有必要对其辨析，取伪存真，还原成吉思汗历史的本来面貌。本文根据《蒙古秘史》《史集》《圣武亲征录》等元代文献，围绕与成吉思汗早起历史相关的一些具体问题重新展开讨论，对也速该・把秃儿去世之后泰赤兀惕部抛弃其寡妇与孤儿，夺走其属部之说提出质疑，并对应如何理解《蒙古秘史》历史性等问题提出了新的见解。
“The Secret History of Mongolia” is the first book to record the history and life of Genghis Khan. However, the descriptions about Genghis Khan are sometimes accompanied by literary exaggeration and fiction, which brings certain difficulties in correctly understood the history of Genghis Khan. Therefore, it is necessary to distinguish and analyze it, select the false and preserve the truth, and restore the original appearance of Genghis Khan's history. This thesis mainly puts forward new insights for how to understand the historicity of “The Secret History of Mongolia” by re-discussing the issue of the history of Genghis Khan's early stage, which is the history of The Tayichiud tribe abandoning its widows and orphans and taking away its subordinate after Yesugei Baghatur died, based on the Yuan Dynasty documents such as “Secret History of Mongolia,” Jami' al-tawarikh (Compendium of Chronicles), “Shengwu Qinzheng Lu,” and other Yuan Dynasty documents.