这是杨志玖教授在南开大学历史系作的一次学术报告,对元史教学工作和研究工作都很有帮助。现由本刊编辑记录整理,经杨先生审订后发表。继本文之后我们拟约请专家继续就其他断代撰写研究心得,供读者参考。 This is an academic report by Professor Yang Zhi Jiu in the history department of Nankai University, which is very helpful to the teaching and research work of Yuan Shi history. Now edited by the editorial records, published by Mr. Yang after the review. Following this article, we intend to invite experts to continue to write research on other dynasties for your reference.