作为重要文物实证的《重修大同镇城碑记》,是曹雪芹祖籍研究的重大发现。其史学价值有五:详细介绍了曹振彦在大同的主要政绩;明确记载了曹振彦的籍贯是襄平;明确指出了襄平与铁岭是两个互不相关的地理名称;明确指明了“三韩”是一个泛指辽东地区的地域概念;证明了襄平是辽阳而不是铁岭,是最新发现的关于曹雪芹家世祖籍的权威性证据。 As an important cultural relics demonstration, “rebuild Datong town tablet”, is Cao Xueqin’s great home study found. The historical value of five: Cao Xiaoyan introduced in detail the main achievements of Datong; clearly documented Cao Zhenyan native place is Xiang Ping; Xiang Ping and Tieling is clearly pointed out that the two unrelated geographic names; clearly pointed out that the “Three Koreas” Is a generalized geographical concept of the Liaodong area. It proves that Xiangping is Liaoyang rather than Tieling. It is the most recently discovered evidence of Cao Xueqin’s ancestral home.