The article explores how the theory of Shuo-wen Jie-zi Zhuan-zhu explains semantic relations between words. It shows that Tong-yi in Shuo-wen Jie-zi means the same way of understanding these relations. The phrases in Shuo-wen Jie-zi share similarities in their origins, contexts, and functions. Tong-yi essentially means the same way of realizing these semantic connections.